diff --git a/source/fuzz/equivalence_relation.h b/source/fuzz/equivalence_relation.h
index 6d0b63e..a01eac0 100644
--- a/source/fuzz/equivalence_relation.h
+++ b/source/fuzz/equivalence_relation.h
@@ -15,6 +15,8 @@
 #ifndef SOURCE_FUZZ_EQUIVALENCE_RELATION_H_
 #define SOURCE_FUZZ_EQUIVALENCE_RELATION_H_
 
+#include <algorithm>
+#include <cassert>
 #include <memory>
 #include <unordered_map>
 #include <unordered_set>
diff --git a/source/fuzz/fuzzer.cpp b/source/fuzz/fuzzer.cpp
index fb7d456..64b0772 100644
--- a/source/fuzz/fuzzer.cpp
+++ b/source/fuzz/fuzzer.cpp
@@ -158,42 +158,11 @@
   }
 }
 
-bool Fuzzer::ApplyPassAndCheckValidity(
-    FuzzerPass* pass, const spvtools::SpirvTools& tools) const {
+bool Fuzzer::ApplyPassAndCheckValidity(FuzzerPass* pass) const {
   pass->Apply();
-  if (validate_after_each_fuzzer_pass_) {
-    std::vector<uint32_t> binary_to_validate;
-    ir_context_->module()->ToBinary(&binary_to_validate, false);
-    if (!tools.Validate(&binary_to_validate[0], binary_to_validate.size(),
-                        validator_options_)) {
-      consumer_(SPV_MSG_INFO, nullptr, {},
-                "Binary became invalid during fuzzing (set a breakpoint to "
-                "inspect); stopping.");
-      return false;
-    }
-    // Check that all blocks in the module have appropriate parent functions.
-    for (auto& function : *ir_context_->module()) {
-      for (auto& block : function) {
-        if (block.GetParent() == nullptr) {
-          std::stringstream ss;
-          ss << "Block " << block.id()
-             << " has no parent; its parent should be " << function.result_id()
-             << ".";
-          consumer_(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
-          return false;
-        }
-        if (block.GetParent() != &function) {
-          std::stringstream ss;
-          ss << "Block " << block.id() << " should have parent "
-             << function.result_id() << " but instead has parent "
-             << block.GetParent() << ".";
-          consumer_(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
-          return false;
-        }
-      }
-    }
-  }
-  return true;
+  return !validate_after_each_fuzzer_pass_ ||
+         fuzzerutil::IsValidAndWellFormed(ir_context_.get(), validator_options_,
+                                          consumer_);
 }
 
 Fuzzer::FuzzerResult Fuzzer::Run() {
@@ -352,8 +321,7 @@
 
   do {
     if (!ApplyPassAndCheckValidity(
-            repeated_pass_manager->ChoosePass(transformation_sequence_out_),
-            tools)) {
+            repeated_pass_manager->ChoosePass(transformation_sequence_out_))) {
       return {Fuzzer::FuzzerResultStatus::kFuzzerPassLedToInvalidModule,
               std::vector<uint32_t>(), protobufs::TransformationSequence()};
     }
@@ -375,7 +343,7 @@
   MaybeAddFinalPass<FuzzerPassSwapCommutableOperands>(&final_passes);
   MaybeAddFinalPass<FuzzerPassToggleAccessChainInstruction>(&final_passes);
   for (auto& pass : final_passes) {
-    if (!ApplyPassAndCheckValidity(pass.get(), tools)) {
+    if (!ApplyPassAndCheckValidity(pass.get())) {
       return {Fuzzer::FuzzerResultStatus::kFuzzerPassLedToInvalidModule,
               std::vector<uint32_t>(), protobufs::TransformationSequence()};
     }
diff --git a/source/fuzz/fuzzer.h b/source/fuzz/fuzzer.h
index 5b06bfd..774457f 100644
--- a/source/fuzz/fuzzer.h
+++ b/source/fuzz/fuzzer.h
@@ -124,10 +124,9 @@
   // Applies |pass|, which must be a pass constructed with |ir_context|.
   // If |validate_after_each_fuzzer_pass_| is not set, true is always returned.
   // Otherwise, true is returned if and only if |ir_context| passes validation,
-  // and if every block has its enclosing function as its parent.  |tools| is
-  // used for checking validity.
-  bool ApplyPassAndCheckValidity(FuzzerPass* pass,
-                                 const spvtools::SpirvTools& tools) const;
+  // every block has its enclosing function as its parent, and every
+  // instruction has a distinct unique id.
+  bool ApplyPassAndCheckValidity(FuzzerPass* pass) const;
 
   // Target environment.
   const spv_target_env target_env_;
diff --git a/source/fuzz/fuzzer_pass_donate_modules.cpp b/source/fuzz/fuzzer_pass_donate_modules.cpp
index afa2224..4cd4804 100644
--- a/source/fuzz/fuzzer_pass_donate_modules.cpp
+++ b/source/fuzz/fuzzer_pass_donate_modules.cpp
@@ -65,10 +65,11 @@
     std::unique_ptr<opt::IRContext> donor_ir_context = donor_suppliers_.at(
         GetFuzzerContext()->RandomIndex(donor_suppliers_))();
     assert(donor_ir_context != nullptr && "Supplying of donor failed");
-    assert(fuzzerutil::IsValid(
-               donor_ir_context.get(),
-               GetTransformationContext()->GetValidatorOptions()) &&
-           "The donor module must be valid");
+    assert(
+        fuzzerutil::IsValid(donor_ir_context.get(),
+                            GetTransformationContext()->GetValidatorOptions(),
+                            fuzzerutil::kSilentMessageConsumer) &&
+        "The donor module must be valid");
     // Donate the supplied module.
     //
     // Randomly decide whether to make the module livesafe (see
diff --git a/source/fuzz/fuzzer_util.cpp b/source/fuzz/fuzzer_util.cpp
index 122f21e..1947853 100644
--- a/source/fuzz/fuzzer_util.cpp
+++ b/source/fuzz/fuzzer_util.cpp
@@ -43,6 +43,10 @@
 
 }  // namespace
 
+const spvtools::MessageConsumer kSilentMessageConsumer =
+    [](spv_message_level_t, const char*, const spv_position_t&,
+       const char*) -> void {};
+
 bool IsFreshId(opt::IRContext* context, uint32_t id) {
   return !context->get_def_use_mgr()->GetDef(id);
 }
@@ -400,13 +404,64 @@
   }
 }
 
-bool IsValid(opt::IRContext* context, spv_validator_options validator_options) {
+bool IsValid(const opt::IRContext* context,
+             spv_validator_options validator_options,
+             MessageConsumer consumer) {
   std::vector<uint32_t> binary;
   context->module()->ToBinary(&binary, false);
   SpirvTools tools(context->grammar().target_env());
+  tools.SetMessageConsumer(consumer);
   return tools.Validate(binary.data(), binary.size(), validator_options);
 }
 
+bool IsValidAndWellFormed(const opt::IRContext* ir_context,
+                          spv_validator_options validator_options,
+                          MessageConsumer consumer) {
+  if (!IsValid(ir_context, validator_options, consumer)) {
+    consumer(SPV_MSG_INFO, nullptr, {},
+             "Module is invalid (set a breakpoint to inspect).");
+    return false;
+  }
+  // Check that all blocks in the module have appropriate parent functions.
+  for (auto& function : *ir_context->module()) {
+    for (auto& block : function) {
+      if (block.GetParent() == nullptr) {
+        std::stringstream ss;
+        ss << "Block " << block.id() << " has no parent; its parent should be "
+           << function.result_id() << " (set a breakpoint to inspect).";
+        consumer(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
+        return false;
+      }
+      if (block.GetParent() != &function) {
+        std::stringstream ss;
+        ss << "Block " << block.id() << " should have parent "
+           << function.result_id() << " but instead has parent "
+           << block.GetParent() << " (set a breakpoint to inspect).";
+        consumer(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
+        return false;
+      }
+    }
+  }
+
+  // Check that all instructions have distinct unique ids.  We map each unique
+  // id to the first instruction it is observed to be associated with so that
+  // if we encounter a duplicate we have access to the previous instruction -
+  // this is a useful aid to debugging.
+  std::unordered_map<uint32_t, opt::Instruction*> unique_ids;
+  bool found_duplicate = false;
+  ir_context->module()->ForEachInst([&consumer, &found_duplicate,
+                                     &unique_ids](opt::Instruction* inst) {
+    if (unique_ids.count(inst->unique_id()) != 0) {
+      consumer(SPV_MSG_INFO, nullptr, {},
+               "Two instructions have the same unique id (set a breakpoint to "
+               "inspect).");
+      found_duplicate = true;
+    }
+    unique_ids.insert({inst->unique_id(), inst});
+  });
+  return !found_duplicate;
+}
+
 std::unique_ptr<opt::IRContext> CloneIRContext(opt::IRContext* context) {
   std::vector<uint32_t> binary;
   context->module()->ToBinary(&binary, false);
diff --git a/source/fuzz/fuzzer_util.h b/source/fuzz/fuzzer_util.h
index 569f4a6..566c535 100644
--- a/source/fuzz/fuzzer_util.h
+++ b/source/fuzz/fuzzer_util.h
@@ -15,6 +15,7 @@
 #ifndef SOURCE_FUZZ_FUZZER_UTIL_H_
 #define SOURCE_FUZZ_FUZZER_UTIL_H_
 
+#include <iostream>
 #include <map>
 #include <vector>
 
@@ -23,6 +24,7 @@
 #include "source/opt/basic_block.h"
 #include "source/opt/instruction.h"
 #include "source/opt/ir_context.h"
+#include "spirv-tools/libspirv.hpp"
 
 namespace spvtools {
 namespace fuzz {
@@ -30,6 +32,9 @@
 // Provides types and global utility methods for use by the fuzzer
 namespace fuzzerutil {
 
+// A silent message consumer.
+extern const spvtools::MessageConsumer kSilentMessageConsumer;
+
 // Function type that produces a SPIR-V module.
 using ModuleSupplier = std::function<std::unique_ptr<opt::IRContext>()>;
 
@@ -150,8 +155,18 @@
                                    opt::IRContext* ir_context);
 
 // Returns true if and only if |context| is valid, according to the validator
-// instantiated with |validator_options|.
-bool IsValid(opt::IRContext* context, spv_validator_options validator_options);
+// instantiated with |validator_options|.  |consumer| is used for error
+// reporting.
+bool IsValid(const opt::IRContext* context,
+             spv_validator_options validator_options, MessageConsumer consumer);
+
+// Returns true if and only if IsValid(|context|, |validator_options|) holds,
+// and furthermore every basic block in |context| has its enclosing function as
+// its parent, and every instruction in |context| has a distinct unique id.
+// |consumer| is used for error reporting.
+bool IsValidAndWellFormed(const opt::IRContext* context,
+                          spv_validator_options validator_options,
+                          MessageConsumer consumer);
 
 // Returns a clone of |context|, by writing |context| to a binary and then
 // parsing it again.
diff --git a/source/fuzz/transformation_add_dead_break.cpp b/source/fuzz/transformation_add_dead_break.cpp
index 2894ccf..bc938d4 100644
--- a/source/fuzz/transformation_add_dead_break.cpp
+++ b/source/fuzz/transformation_add_dead_break.cpp
@@ -182,7 +182,8 @@
   auto cloned_context = fuzzerutil::CloneIRContext(ir_context);
   ApplyImpl(cloned_context.get(), transformation_context);
   return fuzzerutil::IsValid(cloned_context.get(),
-                             transformation_context.GetValidatorOptions());
+                             transformation_context.GetValidatorOptions(),
+                             fuzzerutil::kSilentMessageConsumer);
 }
 
 void TransformationAddDeadBreak::Apply(
diff --git a/source/fuzz/transformation_add_dead_continue.cpp b/source/fuzz/transformation_add_dead_continue.cpp
index 3eee3c8..18b3c39 100644
--- a/source/fuzz/transformation_add_dead_continue.cpp
+++ b/source/fuzz/transformation_add_dead_continue.cpp
@@ -122,7 +122,8 @@
   auto cloned_context = fuzzerutil::CloneIRContext(ir_context);
   ApplyImpl(cloned_context.get(), transformation_context);
   return fuzzerutil::IsValid(cloned_context.get(),
-                             transformation_context.GetValidatorOptions());
+                             transformation_context.GetValidatorOptions(),
+                             fuzzerutil::kSilentMessageConsumer);
 }
 
 void TransformationAddDeadContinue::Apply(
diff --git a/source/fuzz/transformation_add_function.cpp b/source/fuzz/transformation_add_function.cpp
index aea2d08..214f741 100644
--- a/source/fuzz/transformation_add_function.cpp
+++ b/source/fuzz/transformation_add_function.cpp
@@ -135,7 +135,8 @@
   // Check whether the cloned module is still valid after adding the function.
   // If it is not, the transformation is not applicable.
   if (!fuzzerutil::IsValid(cloned_module.get(),
-                           transformation_context.GetValidatorOptions())) {
+                           transformation_context.GetValidatorOptions(),
+                           fuzzerutil::kSilentMessageConsumer)) {
     return false;
   }
 
@@ -151,7 +152,8 @@
     // It is simpler to rely on the validator to guard against this than to
     // consider all scenarios when making a function livesafe.
     if (!fuzzerutil::IsValid(cloned_module.get(),
-                             transformation_context.GetValidatorOptions())) {
+                             transformation_context.GetValidatorOptions(),
+                             fuzzerutil::kSilentMessageConsumer)) {
       return false;
     }
   }
diff --git a/source/fuzz/transformation_add_spec_constant_op.cpp b/source/fuzz/transformation_add_spec_constant_op.cpp
index eba08ac..19c5e85 100644
--- a/source/fuzz/transformation_add_spec_constant_op.cpp
+++ b/source/fuzz/transformation_add_spec_constant_op.cpp
@@ -46,7 +46,8 @@
   auto clone = fuzzerutil::CloneIRContext(ir_context);
   ApplyImpl(clone.get());
   return fuzzerutil::IsValid(clone.get(),
-                             transformation_context.GetValidatorOptions());
+                             transformation_context.GetValidatorOptions(),
+                             fuzzerutil::kSilentMessageConsumer);
 }
 
 void TransformationAddSpecConstantOp::Apply(
diff --git a/source/fuzz/transformation_inline_function.cpp b/source/fuzz/transformation_inline_function.cpp
index cdcee1b..b2a6f09 100644
--- a/source/fuzz/transformation_inline_function.cpp
+++ b/source/fuzz/transformation_inline_function.cpp
@@ -141,16 +141,18 @@
 
   // Inline the |called_function| entry block.
   for (auto& entry_block_instruction : *called_function->entry()) {
-    opt::Instruction* inlined_instruction = nullptr;
+    opt::Instruction* inlined_instruction;
 
     if (entry_block_instruction.opcode() == SpvOpVariable) {
       // All OpVariable instructions in a function must be in the first block
       // in the function.
       inlined_instruction = caller_function->begin()->begin()->InsertBefore(
-          MakeUnique<opt::Instruction>(entry_block_instruction));
+          std::unique_ptr<opt::Instruction>(
+              entry_block_instruction.Clone(ir_context)));
     } else {
       inlined_instruction = function_call_instruction->InsertBefore(
-          MakeUnique<opt::Instruction>(entry_block_instruction));
+          std::unique_ptr<opt::Instruction>(
+              entry_block_instruction.Clone(ir_context)));
     }
 
     AdaptInlinedInstruction(result_id_map, ir_context, inlined_instruction);
diff --git a/test/fuzz/call_graph_test.cpp b/test/fuzz/call_graph_test.cpp
index d8b3134..c9bd221 100644
--- a/test/fuzz/call_graph_test.cpp
+++ b/test/fuzz/call_graph_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/call_graph.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -274,7 +277,9 @@
   const auto consumer = nullptr;
 
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const auto graph = CallGraph(context.get());
 
@@ -292,7 +297,9 @@
   const auto consumer = nullptr;
 
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const auto graph = CallGraph(context.get());
 
@@ -309,7 +316,9 @@
   const auto consumer = nullptr;
 
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const auto graph = CallGraph(context.get());
 
@@ -326,7 +335,9 @@
   const auto consumer = nullptr;
 
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const auto graph = CallGraph(context.get());
 
@@ -347,7 +358,9 @@
   const auto consumer = nullptr;
 
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const auto graph = CallGraph(context.get());
 
diff --git a/test/fuzz/comparator_deep_blocks_first_test.cpp b/test/fuzz/comparator_deep_blocks_first_test.cpp
index 90ca6a7..d7dbde5 100644
--- a/test/fuzz/comparator_deep_blocks_first_test.cpp
+++ b/test/fuzz/comparator_deep_blocks_first_test.cpp
@@ -13,7 +13,10 @@
 // limitations under the License.
 
 #include "source/fuzz/comparator_deep_blocks_first.h"
+
+#include "gtest/gtest.h"
 #include "source/fuzz/fact_manager/fact_manager.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "source/fuzz/transformation_context.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -73,9 +76,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto is_deeper = ComparatorDeepBlocksFirst(context.get());
@@ -105,9 +108,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Check that, sorting using the comparator, the blocks are ordered from more
diff --git a/test/fuzz/data_synonym_transformation_test.cpp b/test/fuzz/data_synonym_transformation_test.cpp
index bbdc0de..7e93f29 100644
--- a/test/fuzz/data_synonym_transformation_test.cpp
+++ b/test/fuzz/data_synonym_transformation_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/data_descriptor.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/id_use_descriptor.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "source/fuzz/transformation_composite_extract.h"
@@ -120,9 +123,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -159,7 +162,8 @@
   ASSERT_TRUE(
       replacement_1.IsApplicable(context.get(), transformation_context));
   replacement_1.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %13 with %100[1] in 'OpStore %15 %13'
   auto instruction_descriptor_2 = MakeInstructionDescriptor(100, SpvOpStore, 0);
@@ -174,7 +178,8 @@
   ASSERT_TRUE(
       replacement_2.IsApplicable(context.get(), transformation_context));
   replacement_2.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %22 with %100[2] in '%23 = OpConvertSToF %16 %22'
   auto instruction_descriptor_3 =
@@ -194,7 +199,8 @@
   ASSERT_FALSE(
       bad_replacement_3.IsApplicable(context.get(), transformation_context));
   replacement_3.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %28 with %101[0] in 'OpStore %33 %28'
   auto instruction_descriptor_4 = MakeInstructionDescriptor(33, SpvOpStore, 0);
@@ -213,7 +219,8 @@
   ASSERT_TRUE(
       replacement_4.IsApplicable(context.get(), transformation_context));
   replacement_4.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %23 with %101[1] in '%50 = OpCopyObject %16 %23'
   auto instruction_descriptor_5 =
@@ -233,7 +240,8 @@
   ASSERT_FALSE(
       bad_replacement_5.IsApplicable(context.get(), transformation_context));
   replacement_5.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %32 with %101[2] in 'OpStore %33 %32'
   auto instruction_descriptor_6 = MakeInstructionDescriptor(33, SpvOpStore, 1);
@@ -252,7 +260,8 @@
   ASSERT_TRUE(
       replacement_6.IsApplicable(context.get(), transformation_context));
   replacement_6.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %23 with %101[3] in '%51 = OpCopyObject %16 %23'
   auto instruction_descriptor_7 =
@@ -272,7 +281,8 @@
   ASSERT_FALSE(
       bad_replacement_7.IsApplicable(context.get(), transformation_context));
   replacement_7.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -407,9 +417,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -431,7 +441,8 @@
   ASSERT_TRUE(
       replacement_1.IsApplicable(context.get(), transformation_context));
   replacement_1.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %25 with %100[1] in '%26 = OpFAdd %7 %23 %25'
   auto instruction_descriptor_2 = MakeInstructionDescriptor(26, SpvOpFAdd, 0);
@@ -444,7 +455,8 @@
   ASSERT_TRUE(
       replacement_2.IsApplicable(context.get(), transformation_context));
   replacement_2.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -576,9 +588,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -609,7 +621,8 @@
   ASSERT_TRUE(
       replacement_1.IsApplicable(context.get(), transformation_context));
   replacement_1.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace second occurrence of %27 with %101[0] in '%28 =
   // OpCompositeConstruct %8 %27 %27'
@@ -624,7 +637,8 @@
   ASSERT_TRUE(
       replacement_2.IsApplicable(context.get(), transformation_context));
   replacement_2.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %36 with %101[1] in '%45 = OpCompositeConstruct %31 %36 %41 %44'
   auto instruction_descriptor_3 =
@@ -638,7 +652,8 @@
   ASSERT_TRUE(
       replacement_3.IsApplicable(context.get(), transformation_context));
   replacement_3.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace first occurrence of %27 with %101[2] in '%28 = OpCompositeConstruct
   // %8 %27 %27'
@@ -653,7 +668,8 @@
   ASSERT_TRUE(
       replacement_4.IsApplicable(context.get(), transformation_context));
   replacement_4.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %22 with %102[0] in 'OpStore %23 %22'
   auto instruction_descriptor_5 = MakeInstructionDescriptor(23, SpvOpStore, 0);
@@ -666,7 +682,8 @@
   ASSERT_TRUE(
       replacement_5.IsApplicable(context.get(), transformation_context));
   replacement_5.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -865,9 +882,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -926,7 +943,8 @@
   ASSERT_TRUE(
       replacement_1.IsApplicable(context.get(), transformation_context));
   replacement_1.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %54 with %100[3] in '%56 = OpFOrdNotEqual %30 %54 %55'
   auto instruction_descriptor_2 =
@@ -941,7 +959,8 @@
   ASSERT_TRUE(
       replacement_2.IsApplicable(context.get(), transformation_context));
   replacement_2.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %15 with %101[0:1] in 'OpStore %12 %15'
   auto instruction_descriptor_3 = MakeInstructionDescriptor(64, SpvOpStore, 0);
@@ -956,7 +975,8 @@
   ASSERT_TRUE(
       replacement_3.IsApplicable(context.get(), transformation_context));
   replacement_3.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %19 with %101[2:3] in '%81 = OpVectorShuffle %16 %19 %19 0 0 1'
   auto instruction_descriptor_4 =
@@ -972,7 +992,8 @@
   ASSERT_TRUE(
       replacement_4.IsApplicable(context.get(), transformation_context));
   replacement_4.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %27 with %102[0] in '%82 = OpCompositeConstruct %21 %26 %27 %28
   // %25'
@@ -988,7 +1009,8 @@
   ASSERT_TRUE(
       replacement_5.IsApplicable(context.get(), transformation_context));
   replacement_5.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %15 with %102[1:2] in '%83 = OpCopyObject %10 %15'
   auto instruction_descriptor_6 =
@@ -1004,7 +1026,8 @@
   ASSERT_TRUE(
       replacement_6.IsApplicable(context.get(), transformation_context));
   replacement_6.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %33 with %103[0] in '%86 = OpCopyObject %30 %33'
   auto instruction_descriptor_7 =
@@ -1018,7 +1041,8 @@
   ASSERT_TRUE(
       replacement_7.IsApplicable(context.get(), transformation_context));
   replacement_7.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %47 with %103[1:3] in '%84 = OpCopyObject %39 %47'
   auto instruction_descriptor_8 =
@@ -1034,7 +1058,8 @@
   ASSERT_TRUE(
       replacement_8.IsApplicable(context.get(), transformation_context));
   replacement_8.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %42 with %104[0] in '%85 = OpCopyObject %30 %42'
   auto instruction_descriptor_9 =
@@ -1048,7 +1073,8 @@
   ASSERT_TRUE(
       replacement_9.IsApplicable(context.get(), transformation_context));
   replacement_9.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %45 with %104[1] in '%63 = OpLogicalOr %30 %45 %46'
   auto instruction_descriptor_10 =
@@ -1062,7 +1088,8 @@
   ASSERT_TRUE(
       replacement_10.IsApplicable(context.get(), transformation_context));
   replacement_10.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %38 with %105[0:1] in 'OpStore %36 %38'
   auto instruction_descriptor_11 = MakeInstructionDescriptor(85, SpvOpStore, 0);
@@ -1077,7 +1104,8 @@
   ASSERT_TRUE(
       replacement_11.IsApplicable(context.get(), transformation_context));
   replacement_11.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %46 with %105[2] in '%62 = OpLogicalAnd %30 %45 %46'
   auto instruction_descriptor_12 =
@@ -1091,7 +1119,8 @@
   ASSERT_TRUE(
       replacement_12.IsApplicable(context.get(), transformation_context));
   replacement_12.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/equivalence_relation_test.cpp b/test/fuzz/equivalence_relation_test.cpp
index 280aa3a..431488e 100644
--- a/test/fuzz/equivalence_relation_test.cpp
+++ b/test/fuzz/equivalence_relation_test.cpp
@@ -14,9 +14,10 @@
 
 #include <set>
 
+#include "source/fuzz/equivalence_relation.h"
+
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
-#include "source/fuzz/equivalence_relation.h"
 
 namespace spvtools {
 namespace fuzz {
diff --git a/test/fuzz/fact_manager/constant_uniform_facts_test.cpp b/test/fuzz/fact_manager/constant_uniform_facts_test.cpp
index a6a49be..4d80f0a 100644
--- a/test/fuzz/fact_manager/constant_uniform_facts_test.cpp
+++ b/test/fuzz/fact_manager/constant_uniform_facts_test.cpp
@@ -15,6 +15,9 @@
 #include <limits>
 
 #include "source/fuzz/fact_manager/fact_manager.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/uniform_buffer_element_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -202,7 +205,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   uint32_t buffer_int32_min[1];
   uint32_t buffer_int64_1[2];
@@ -531,7 +536,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -596,7 +603,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
   auto uniform_buffer_element_descriptor_f =
@@ -711,7 +720,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
   auto uniform_buffer_element_descriptor =
@@ -757,7 +768,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
diff --git a/test/fuzz/fact_manager/data_synonym_and_id_equation_facts_test.cpp b/test/fuzz/fact_manager/data_synonym_and_id_equation_facts_test.cpp
index c9a7005..689d2e7 100644
--- a/test/fuzz/fact_manager/data_synonym_and_id_equation_facts_test.cpp
+++ b/test/fuzz/fact_manager/data_synonym_and_id_equation_facts_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/fact_manager/fact_manager.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/transformation_merge_blocks.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -62,7 +65,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -124,7 +129,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -197,9 +204,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -216,7 +223,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   transformation.Apply(context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   CheckConsistencyOfSynonymFacts(context.get(), transformation_context);
 
@@ -276,7 +284,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -320,7 +330,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -362,7 +374,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -418,7 +432,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -494,7 +510,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -579,7 +597,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -625,7 +645,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
diff --git a/test/fuzz/fact_manager/dead_block_facts_test.cpp b/test/fuzz/fact_manager/dead_block_facts_test.cpp
index 0799d00..7328fd2 100644
--- a/test/fuzz/fact_manager/dead_block_facts_test.cpp
+++ b/test/fuzz/fact_manager/dead_block_facts_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/fact_manager/fact_manager.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -49,7 +52,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
diff --git a/test/fuzz/fact_manager/irrelevant_value_facts_test.cpp b/test/fuzz/fact_manager/irrelevant_value_facts_test.cpp
index aae614a..9fc0867 100644
--- a/test/fuzz/fact_manager/irrelevant_value_facts_test.cpp
+++ b/test/fuzz/fact_manager/irrelevant_value_facts_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/fact_manager/fact_manager.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -41,7 +44,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -77,7 +82,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
@@ -135,7 +142,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   FactManager fact_manager(context.get());
 
diff --git a/test/fuzz/fuzz_test_util.cpp b/test/fuzz/fuzz_test_util.cpp
index 1654b45..28d3f89 100644
--- a/test/fuzz/fuzz_test_util.cpp
+++ b/test/fuzz/fuzz_test_util.cpp
@@ -14,6 +14,8 @@
 
 #include "test/fuzz/fuzz_test_util.h"
 
+#include "gtest/gtest.h"
+
 #include <fstream>
 #include <iostream>
 
@@ -23,6 +25,29 @@
 namespace spvtools {
 namespace fuzz {
 
+const spvtools::MessageConsumer kConsoleMessageConsumer =
+    [](spv_message_level_t level, const char*, const spv_position_t& position,
+       const char* message) -> void {
+  switch (level) {
+    case SPV_MSG_FATAL:
+    case SPV_MSG_INTERNAL_ERROR:
+    case SPV_MSG_ERROR:
+      std::cerr << "error: line " << position.index << ": " << message
+                << std::endl;
+      break;
+    case SPV_MSG_WARNING:
+      std::cout << "warning: line " << position.index << ": " << message
+                << std::endl;
+      break;
+    case SPV_MSG_INFO:
+      std::cout << "info: line " << position.index << ": " << message
+                << std::endl;
+      break;
+    default:
+      break;
+  }
+};
+
 bool IsEqual(const spv_target_env env,
              const std::vector<uint32_t>& expected_binary,
              const std::vector<uint32_t>& actual_binary) {
@@ -80,42 +105,6 @@
   return IsEqual(env, binary_1, binary_2);
 }
 
-bool IsValid(spv_target_env env, const opt::IRContext* ir) {
-  MessageConsumer consumer = kConsoleMessageConsumer;
-
-  // First, run the validator.
-  std::vector<uint32_t> binary;
-  ir->module()->ToBinary(&binary, false);
-  SpirvTools t(env);
-  t.SetMessageConsumer(consumer);
-  if (!t.Validate(binary)) {
-    return false;
-  }
-
-  // Now check that every block in the module has the appropriate parent
-  // function.
-  for (auto& function : *ir->module()) {
-    for (auto& block : function) {
-      if (block.GetParent() == nullptr) {
-        std::stringstream ss;
-        ss << "Block " << block.id() << " has no parent; its parent should be "
-           << function.result_id() << ".";
-        consumer(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
-        return false;
-      }
-      if (block.GetParent() != &function) {
-        std::stringstream ss;
-        ss << "Block " << block.id() << " should have parent "
-           << function.result_id() << " but instead has parent "
-           << block.GetParent() << ".";
-        consumer(SPV_MSG_INFO, nullptr, {}, ss.str().c_str());
-        return false;
-      }
-    }
-  }
-  return true;
-}
-
 std::string ToString(spv_target_env env, const opt::IRContext* ir) {
   std::vector<uint32_t> binary;
   ir->module()->ToBinary(&binary, false);
@@ -143,6 +132,15 @@
   }
 }
 
+void DumpTransformationsBinary(
+    const protobufs::TransformationSequence& transformations,
+    const char* filename) {
+  std::ofstream transformations_file;
+  transformations_file.open(filename, std::ios::out | std::ios::binary);
+  transformations.SerializeToOstream(&transformations_file);
+  transformations_file.close();
+}
+
 void DumpTransformationsJson(
     const protobufs::TransformationSequence& transformations,
     const char* filename) {
diff --git a/test/fuzz/fuzz_test_util.h b/test/fuzz/fuzz_test_util.h
index 7099609..1ee0875 100644
--- a/test/fuzz/fuzz_test_util.h
+++ b/test/fuzz/fuzz_test_util.h
@@ -17,7 +17,6 @@
 
 #include <vector>
 
-#include "gtest/gtest.h"
 #include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
 #include "source/fuzz/transformation.h"
 #include "source/fuzz/transformation_context.h"
@@ -28,6 +27,8 @@
 namespace spvtools {
 namespace fuzz {
 
+extern const spvtools::MessageConsumer kConsoleMessageConsumer;
+
 // Returns true if and only if the given binaries are bit-wise equal.
 bool IsEqual(spv_target_env env, const std::vector<uint32_t>& expected_binary,
              const std::vector<uint32_t>& actual_binary);
@@ -52,11 +53,6 @@
 bool IsEqual(spv_target_env env, const std::vector<uint32_t>& binary_1,
              const opt::IRContext* ir_2);
 
-// Assembles the given IR context and returns true if and only if
-// the resulting binary is valid and every basic block has its enclosing
-// function as its parent.
-bool IsValid(spv_target_env env, const opt::IRContext* ir);
-
 // Assembles the given IR context, then returns its disassembly as a string.
 // Useful for debugging.
 std::string ToString(spv_target_env env, const opt::IRContext* ir);
@@ -73,34 +69,6 @@
 const uint32_t kFuzzDisassembleOption =
     SPV_BINARY_TO_TEXT_OPTION_NO_HEADER | SPV_BINARY_TO_TEXT_OPTION_INDENT;
 
-// A silent message consumer.
-const spvtools::MessageConsumer kSilentConsumer =
-    [](spv_message_level_t, const char*, const spv_position_t&,
-       const char*) -> void {};
-
-const spvtools::MessageConsumer kConsoleMessageConsumer =
-    [](spv_message_level_t level, const char*, const spv_position_t& position,
-       const char* message) -> void {
-  switch (level) {
-    case SPV_MSG_FATAL:
-    case SPV_MSG_INTERNAL_ERROR:
-    case SPV_MSG_ERROR:
-      std::cerr << "error: line " << position.index << ": " << message
-                << std::endl;
-      break;
-    case SPV_MSG_WARNING:
-      std::cout << "warning: line " << position.index << ": " << message
-                << std::endl;
-      break;
-    case SPV_MSG_INFO:
-      std::cout << "info: line " << position.index << ": " << message
-                << std::endl;
-      break;
-    default:
-      break;
-  }
-};
-
 // Dumps the SPIRV-V module in |context| to file |filename|. Useful for
 // interactive debugging.
 void DumpShader(opt::IRContext* context, const char* filename);
@@ -108,6 +76,12 @@
 // Dumps |binary| to file |filename|. Useful for interactive debugging.
 void DumpShader(const std::vector<uint32_t>& binary, const char* filename);
 
+// Dumps |transformations| to file |filename| in binary format. Useful for
+// interactive debugging.
+void DumpTransformationsBinary(
+    const protobufs::TransformationSequence& transformations,
+    const char* filename);
+
 // Dumps |transformations| to file |filename| in JSON format. Useful for
 // interactive debugging.
 void DumpTransformationsJson(
diff --git a/test/fuzz/fuzzer_pass_add_opphi_synonyms_test.cpp b/test/fuzz/fuzzer_pass_add_opphi_synonyms_test.cpp
index 0e10a42..f7a0996 100644
--- a/test/fuzz/fuzzer_pass_add_opphi_synonyms_test.cpp
+++ b/test/fuzz/fuzzer_pass_add_opphi_synonyms_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/fuzzer_pass_add_opphi_synonyms.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -120,9 +123,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   PseudoRandomGenerator prng(0);
diff --git a/test/fuzz/fuzzer_pass_construct_composites_test.cpp b/test/fuzz/fuzzer_pass_construct_composites_test.cpp
index fa335e5..d49d1d6 100644
--- a/test/fuzz/fuzzer_pass_construct_composites_test.cpp
+++ b/test/fuzz/fuzzer_pass_construct_composites_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/fuzzer_pass_construct_composites.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -80,9 +82,9 @@
   for (uint32_t i = 0; i < 10; i++) {
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     FuzzerContext fuzzer_context(prng.get(), 100);
@@ -95,7 +97,8 @@
     fuzzer_pass.Apply();
 
     // We just check that the result is valid.
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 }
 
@@ -160,9 +163,9 @@
   for (uint32_t i = 0; i < 10; i++) {
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     FuzzerContext fuzzer_context(prng.get(), 100);
@@ -175,7 +178,8 @@
     fuzzer_pass.Apply();
 
     // We just check that the result is valid.
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 }
 
diff --git a/test/fuzz/fuzzer_pass_donate_modules_test.cpp b/test/fuzz/fuzzer_pass_donate_modules_test.cpp
index 09f62dd..1a7cd4a 100644
--- a/test/fuzz/fuzzer_pass_donate_modules_test.cpp
+++ b/test/fuzz/fuzzer_pass_donate_modules_test.cpp
@@ -16,6 +16,7 @@
 
 #include <algorithm>
 
+#include "gtest/gtest.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -188,15 +189,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -212,7 +216,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonationWithUniforms) {
@@ -265,15 +270,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -287,7 +295,8 @@
 
   fuzzer_pass.DonateSingleModule(donor_context.get(), false);
 
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -392,15 +401,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -414,7 +426,8 @@
 
   fuzzer_pass.DonateSingleModule(donor_context.get(), false);
 
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -483,15 +496,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context = BuildModule(
       env, consumer, recipient_and_donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -507,7 +523,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateOpConstantNull) {
@@ -549,15 +566,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -573,7 +593,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateCodeThatUsesImages) {
@@ -673,15 +694,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -697,7 +721,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateCodeThatUsesSampler) {
@@ -765,15 +790,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -789,7 +817,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateCodeThatUsesImageStructField) {
@@ -893,15 +922,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -917,7 +949,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateCodeThatUsesImageFunctionParameter) {
@@ -1025,15 +1058,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1049,7 +1085,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateShaderWithImageStorageClass) {
@@ -1103,15 +1140,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1127,7 +1167,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateComputeShaderWithRuntimeArray) {
@@ -1186,15 +1227,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1210,7 +1254,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateComputeShaderWithRuntimeArrayLivesafe) {
@@ -1286,15 +1331,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1310,7 +1358,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateComputeShaderWithWorkgroupVariables) {
@@ -1354,15 +1403,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1378,7 +1430,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, DonateComputeShaderWithAtomics) {
@@ -1460,15 +1513,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1484,7 +1540,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, Miscellaneous1) {
@@ -1640,15 +1697,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1664,7 +1724,8 @@
 
   // We just check that the result is valid.  Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, OpSpecConstantInstructions) {
@@ -1708,15 +1769,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1731,7 +1795,8 @@
   fuzzer_pass.DonateSingleModule(donor_context.get(), false);
 
   // Check that the module is valid first.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1861,15 +1926,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_0;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1883,7 +1951,8 @@
 
   fuzzer_pass.DonateSingleModule(donor_context.get(), false);
 
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 TEST(FuzzerPassDonateModulesTest, HandlesCapabilities) {
@@ -1930,15 +1999,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -1976,7 +2048,8 @@
   fuzzer_pass.DonateSingleModule(donor_context.get(), false);
 
   // Check that donation was successful.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -2159,15 +2232,18 @@
 
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
+  spvtools::ValidatorOptions validator_options;
+
   const auto recipient_context =
       BuildModule(env, consumer, recipient_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_context =
       BuildModule(env, consumer, donor_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_context.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(recipient_context.get()), validator_options);
 
@@ -2183,7 +2259,8 @@
 
   // We just check that the result is valid. Checking to what it should be
   // exactly equal to would be very fragile.
-  ASSERT_TRUE(IsValid(env, recipient_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      recipient_context.get(), validator_options, kConsoleMessageConsumer));
 }
 
 }  // namespace
diff --git a/test/fuzz/fuzzer_pass_outline_functions_test.cpp b/test/fuzz/fuzzer_pass_outline_functions_test.cpp
index 50d2412..576962c 100644
--- a/test/fuzz/fuzzer_pass_outline_functions_test.cpp
+++ b/test/fuzz/fuzzer_pass_outline_functions_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/fuzzer_pass_outline_functions.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -117,9 +119,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   PseudoRandomGenerator prng(0);
@@ -160,9 +162,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   PseudoRandomGenerator prng(0);
@@ -284,9 +286,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   PseudoRandomGenerator prng(0);
@@ -451,9 +453,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   PseudoRandomGenerator prng(0);
diff --git a/test/fuzz/fuzzer_pass_test.cpp b/test/fuzz/fuzzer_pass_test.cpp
index 6691042..283aa11 100644
--- a/test/fuzz/fuzzer_pass_test.cpp
+++ b/test/fuzz/fuzzer_pass_test.cpp
@@ -12,7 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_pass_add_opphi_synonyms.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -74,9 +76,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Check that %5 is reachable and %8 is unreachable as expected.
diff --git a/test/fuzz/fuzzer_replayer_test.cpp b/test/fuzz/fuzzer_replayer_test.cpp
index 3925e0b..43bc0b5 100644
--- a/test/fuzz/fuzzer_replayer_test.cpp
+++ b/test/fuzz/fuzzer_replayer_test.cpp
@@ -13,9 +13,11 @@
 // limitations under the License.
 
 #include "source/fuzz/fuzzer.h"
+#include "source/fuzz/replayer.h"
+
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
-#include "source/fuzz/replayer.h"
 #include "source/fuzz/uniform_buffer_element_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
diff --git a/test/fuzz/fuzzer_shrinker_test.cpp b/test/fuzz/fuzzer_shrinker_test.cpp
index 361f5e8..6d9dad3 100644
--- a/test/fuzz/fuzzer_shrinker_test.cpp
+++ b/test/fuzz/fuzzer_shrinker_test.cpp
@@ -12,13 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "source/fuzz/fuzzer.h"
+#include "source/fuzz/shrinker.h"
+
 #include <functional>
 #include <vector>
 
-#include "source/fuzz/fuzzer.h"
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
-#include "source/fuzz/shrinker.h"
 #include "source/fuzz/uniform_buffer_element_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -992,7 +994,7 @@
     spv_validator_options validator_options) {
   // Run the shrinker.
   auto shrinker_result =
-      Shrinker(target_env, kSilentConsumer, binary_in, initial_facts,
+      Shrinker(target_env, kConsoleMessageConsumer, binary_in, initial_facts,
                transformation_sequence_in, interestingness_function, step_limit,
                false, validator_options)
           .Run();
@@ -1054,9 +1056,9 @@
   }
 
   auto fuzzer_result =
-      Fuzzer(env, kSilentConsumer, binary_in, initial_facts, donor_suppliers,
-             MakeUnique<PseudoRandomGenerator>(seed), enable_all_passes,
-             repeated_pass_strategy, true, validator_options)
+      Fuzzer(env, kConsoleMessageConsumer, binary_in, initial_facts,
+             donor_suppliers, MakeUnique<PseudoRandomGenerator>(seed),
+             enable_all_passes, repeated_pass_strategy, true, validator_options)
           .Run();
   ASSERT_EQ(Fuzzer::FuzzerResultStatus::kComplete, fuzzer_result.status);
   ASSERT_TRUE(t.Validate(fuzzer_result.transformed_binary));
diff --git a/test/fuzz/instruction_descriptor_test.cpp b/test/fuzz/instruction_descriptor_test.cpp
index c905aa1..3c04d7e 100644
--- a/test/fuzz/instruction_descriptor_test.cpp
+++ b/test/fuzz/instruction_descriptor_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/instruction_descriptor.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -52,7 +54,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   for (auto& function : *context->module()) {
     for (auto& block : function) {
diff --git a/test/fuzz/replayer_test.cpp b/test/fuzz/replayer_test.cpp
index f14d915..7fa4928 100644
--- a/test/fuzz/replayer_test.cpp
+++ b/test/fuzz/replayer_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/replayer.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/data_descriptor.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "source/fuzz/transformation_add_constant_scalar.h"
 #include "source/fuzz/transformation_add_global_variable.h"
@@ -80,7 +82,7 @@
 
   std::vector<uint32_t> binary_in;
   SpirvTools t(env);
-  t.SetMessageConsumer(kSilentConsumer);
+  t.SetMessageConsumer(kConsoleMessageConsumer);
   ASSERT_TRUE(t.Assemble(kTestShader, &binary_in, kFuzzAssembleOption));
   ASSERT_TRUE(t.Validate(binary_in));
 
@@ -96,8 +98,8 @@
     // Full replay
     protobufs::FactSequence empty_facts;
     auto replayer_result =
-        Replayer(env, kSilentConsumer, binary_in, empty_facts, transformations,
-                 11, true, validator_options)
+        Replayer(env, kConsoleMessageConsumer, binary_in, empty_facts,
+                 transformations, 11, true, validator_options)
             .Run();
     // Replay should succeed.
     ASSERT_EQ(Replayer::ReplayerResultStatus::kComplete,
@@ -182,8 +184,8 @@
     // Half replay
     protobufs::FactSequence empty_facts;
     auto replayer_result =
-        Replayer(env, kSilentConsumer, binary_in, empty_facts, transformations,
-                 5, true, validator_options)
+        Replayer(env, kConsoleMessageConsumer, binary_in, empty_facts,
+                 transformations, 5, true, validator_options)
             .Run();
     // Replay should succeed.
     ASSERT_EQ(Replayer::ReplayerResultStatus::kComplete,
@@ -260,8 +262,8 @@
     // Empty replay
     protobufs::FactSequence empty_facts;
     auto replayer_result =
-        Replayer(env, kSilentConsumer, binary_in, empty_facts, transformations,
-                 0, true, validator_options)
+        Replayer(env, kConsoleMessageConsumer, binary_in, empty_facts,
+                 transformations, 0, true, validator_options)
             .Run();
     // Replay should succeed.
     ASSERT_EQ(Replayer::ReplayerResultStatus::kComplete,
@@ -278,8 +280,8 @@
     // The number of transformations requested to be applied exceeds the number
     // of transformations
     auto replayer_result =
-        Replayer(env, kSilentConsumer, binary_in, empty_facts, transformations,
-                 12, true, validator_options)
+        Replayer(env, kConsoleMessageConsumer, binary_in, empty_facts,
+                 transformations, 12, true, validator_options)
             .Run();
 
     // Replay should not succeed.
@@ -324,7 +326,7 @@
 
   std::vector<uint32_t> binary_in;
   SpirvTools t(env);
-  t.SetMessageConsumer(kSilentConsumer);
+  t.SetMessageConsumer(kConsoleMessageConsumer);
   ASSERT_TRUE(t.Assemble(kTestShader, &binary_in, kFuzzAssembleOption));
   ASSERT_TRUE(t.Validate(binary_in));
 
@@ -348,8 +350,9 @@
   // Full replay
   protobufs::FactSequence empty_facts;
   auto replayer_result =
-      Replayer(env, kSilentConsumer, binary_in, empty_facts, transformations,
-               transformations.transformation_size(), true, validator_options)
+      Replayer(env, kConsoleMessageConsumer, binary_in, empty_facts,
+               transformations, transformations.transformation_size(), true,
+               validator_options)
           .Run();
   // Replay should succeed.
   ASSERT_EQ(Replayer::ReplayerResultStatus::kComplete, replayer_result.status);
diff --git a/test/fuzz/shrinker_test.cpp b/test/fuzz/shrinker_test.cpp
index e5e3776..1ea2c16 100644
--- a/test/fuzz/shrinker_test.cpp
+++ b/test/fuzz/shrinker_test.cpp
@@ -14,9 +14,11 @@
 
 #include "source/fuzz/shrinker.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fact_manager/fact_manager.h"
 #include "source/fuzz/fuzzer_context.h"
 #include "source/fuzz/fuzzer_pass_donate_modules.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/pseudo_random_generator.h"
 #include "source/fuzz/transformation_context.h"
 #include "source/opt/ir_context.h"
@@ -142,24 +144,27 @@
   // compilers are kept happy.  See:
   // https://developercommunity.visualstudio.com/content/problem/367326/problems-with-capturing-constexpr-in-lambda.html
   spv_target_env env = SPV_ENV_UNIVERSAL_1_3;
-  const auto consumer = kSilentConsumer;
+  const auto consumer = kConsoleMessageConsumer;
 
   SpirvTools tools(env);
   std::vector<uint32_t> reference_binary;
   ASSERT_TRUE(
       tools.Assemble(kReferenceModule, &reference_binary, kFuzzAssembleOption));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto variant_ir_context =
       BuildModule(env, consumer, kReferenceModule, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, variant_ir_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      variant_ir_context.get(), validator_options, kConsoleMessageConsumer));
 
   const auto donor_ir_context =
       BuildModule(env, consumer, kDonorModule, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, donor_ir_context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      donor_ir_context.get(), validator_options, kConsoleMessageConsumer));
 
   PseudoRandomGenerator random_generator(0);
   FuzzerContext fuzzer_context(&random_generator, 100);
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(variant_ir_context.get()), validator_options);
 
diff --git a/test/fuzz/transformation_access_chain_test.cpp b/test/fuzz/transformation_access_chain_test.cpp
index 9b853fc..5c43127 100644
--- a/test/fuzz/transformation_access_chain_test.cpp
+++ b/test/fuzz/transformation_access_chain_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/transformation_access_chain.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -101,7 +104,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Types:
   // Ptr | Pointee | Storage class | GLSL for pointee    | Ids of this type
@@ -117,7 +122,6 @@
 
   // Indices 0-5 are in ids 80-85
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
@@ -217,7 +221,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(100));
   }
@@ -229,7 +234,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(101));
   }
@@ -241,7 +247,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(103));
   }
@@ -253,7 +260,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(104));
   }
@@ -265,7 +273,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(105));
   }
@@ -277,7 +286,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(106));
   }
@@ -289,7 +299,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(107));
   }
@@ -406,9 +417,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   {
@@ -418,7 +429,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationAccessChain transformation(
@@ -427,7 +439,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -514,9 +527,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: no ids given for clamping
@@ -570,7 +583,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -581,7 +595,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -592,7 +607,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -603,7 +619,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -614,7 +631,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_add_bit_instruction_synonym_test.cpp b/test/fuzz/transformation_add_bit_instruction_synonym_test.cpp
index 132f020..9760ed3 100644
--- a/test/fuzz/transformation_add_bit_instruction_synonym_test.cpp
+++ b/test/fuzz/transformation_add_bit_instruction_synonym_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_bit_instruction_synonym.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -79,9 +81,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests undefined bit instruction.
@@ -218,9 +220,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -454,7 +456,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -516,9 +519,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -717,7 +720,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -779,9 +783,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -803,7 +807,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // No synonym should have been created, since the bit instruction is
   // irrelevant.
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
@@ -868,9 +873,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -892,7 +897,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // No synonym should have been created, since the bit instruction is
   // irrelevant.
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
diff --git a/test/fuzz/transformation_add_constant_boolean_test.cpp b/test/fuzz/transformation_add_constant_boolean_test.cpp
index 4a8072c..3506db6 100644
--- a/test/fuzz/transformation_add_constant_boolean_test.cpp
+++ b/test/fuzz/transformation_add_constant_boolean_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_constant_boolean.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -41,9 +43,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // True and false can both be added as neither is present.
@@ -67,7 +69,8 @@
 
   ASSERT_TRUE(add_true.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(add_true, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Having added true, we cannot add it again with the same id.
   ASSERT_FALSE(add_true.IsApplicable(context.get(), transformation_context));
@@ -76,11 +79,13 @@
   ASSERT_TRUE(
       add_true_again.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(add_true_again, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(add_false.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(add_false, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Having added false, we cannot add it again with the same id.
   ASSERT_FALSE(add_false.IsApplicable(context.get(), transformation_context));
@@ -90,7 +95,8 @@
       add_false_again.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(add_false_again, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // We can create an irrelevant OpConstantTrue.
   TransformationAddConstantBoolean irrelevant_true(102, true, true);
@@ -98,7 +104,8 @@
       irrelevant_true.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(irrelevant_true, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // We can create an irrelevant OpConstantFalse.
   TransformationAddConstantBoolean irrelevant_false(103, false, true);
@@ -106,7 +113,8 @@
       irrelevant_false.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(irrelevant_false, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(100));
   ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(101));
@@ -159,9 +167,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Neither true nor false can be added as OpTypeBool is not present.
diff --git a/test/fuzz/transformation_add_constant_composite_test.cpp b/test/fuzz/transformation_add_constant_composite_test.cpp
index 2b8b838..2c296fb 100644
--- a/test/fuzz/transformation_add_constant_composite_test.cpp
+++ b/test/fuzz/transformation_add_constant_composite_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_constant_composite.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -62,9 +64,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Too few ids
@@ -131,7 +133,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   for (uint32_t id = 100; id <= 106; ++id) {
     ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(id));
@@ -229,9 +232,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_0;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationAddConstantComposite(100, 7, {10, 10}, false)
@@ -272,9 +275,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationAddConstantComposite(100, 7, {10, 10}, false)
diff --git a/test/fuzz/transformation_add_constant_null_test.cpp b/test/fuzz/transformation_add_constant_null_test.cpp
index 6811669..ce20a67 100644
--- a/test/fuzz/transformation_add_constant_null_test.cpp
+++ b/test/fuzz/transformation_add_constant_null_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_constant_null.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -48,9 +50,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -101,7 +103,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_constant_scalar_test.cpp b/test/fuzz/transformation_add_constant_scalar_test.cpp
index 2b7f48f..a153fb1 100644
--- a/test/fuzz/transformation_add_constant_scalar_test.cpp
+++ b/test/fuzz/transformation_add_constant_scalar_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_constant_scalar.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -68,9 +70,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests |fresh_id| being non-fresh.
@@ -162,9 +164,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Adds 32-bit unsigned integer (1 logical operand with 1 word).
@@ -173,7 +175,8 @@
   auto* constant_instruction = context->get_def_use_mgr()->GetDef(19);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds 32-bit signed integer (1 logical operand with 1 word).
   transformation = TransformationAddConstantScalar(20, 3, {5}, false);
@@ -181,7 +184,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(20);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds 32-bit float (1 logical operand with 1 word).
   transformation = TransformationAddConstantScalar(
@@ -190,7 +194,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(21);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds 64-bit unsigned integer (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(22, 5, {7, 0}, false);
@@ -198,7 +203,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(22);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds 64-bit signed integer (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(23, 6, {8, 0}, false);
@@ -206,7 +212,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(23);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds 64-bit float (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(
@@ -215,7 +222,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(24);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 32-bit unsigned integer (1 logical operand with 1 word).
   transformation = TransformationAddConstantScalar(25, 2, {10}, true);
@@ -223,7 +231,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(25);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 32-bit signed integer (1 logical operand with 1 word).
   transformation = TransformationAddConstantScalar(26, 3, {11}, true);
@@ -231,7 +240,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(26);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 32-bit float (1 logical operand with 1 word).
   transformation = TransformationAddConstantScalar(
@@ -240,7 +250,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(27);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 1);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 64-bit unsigned integer (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(28, 5, {13, 0}, true);
@@ -248,7 +259,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(28);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 64-bit signed integer (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(29, 6, {14, 0}, true);
@@ -256,7 +268,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(29);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Adds irrelevant 64-bit float (1 logical operand with 2 words).
   transformation = TransformationAddConstantScalar(
@@ -265,7 +278,8 @@
   constant_instruction = context->get_def_use_mgr()->GetDef(30);
   EXPECT_EQ(constant_instruction->NumInOperands(), 1);
   EXPECT_EQ(constant_instruction->NumInOperandWords(), 2);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   for (uint32_t result_id = 19; result_id <= 24; ++result_id) {
     ASSERT_FALSE(
diff --git a/test/fuzz/transformation_add_copy_memory_test.cpp b/test/fuzz/transformation_add_copy_memory_test.cpp
index be4a300..e599cae 100644
--- a/test/fuzz/transformation_add_copy_memory_test.cpp
+++ b/test/fuzz/transformation_add_copy_memory_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_copy_memory.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -138,9 +140,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Target id is not fresh (59).
@@ -242,7 +244,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_TRUE(
         transformation_context.GetFactManager()->PointeeValueIsIrrelevant(
             fresh_id));
@@ -416,9 +419,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_0;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(
@@ -462,9 +465,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(
diff --git a/test/fuzz/transformation_add_dead_block_test.cpp b/test/fuzz/transformation_add_dead_block_test.cpp
index a72f150..687f00c 100644
--- a/test/fuzz/transformation_add_dead_block_test.cpp
+++ b/test/fuzz/transformation_add_dead_block_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_dead_block.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -60,9 +62,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id 4 is already in use
@@ -135,7 +137,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -168,9 +171,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
@@ -214,9 +217,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad because 9's successor is the loop continue target.
@@ -258,9 +261,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad because 8 is a loop head.
@@ -296,16 +299,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationAddDeadBlock transformation(100, 5, true);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(100));
 
@@ -367,9 +371,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // 9 is a back edge block, so it would not be OK to add a dead block here,
diff --git a/test/fuzz/transformation_add_dead_break_test.cpp b/test/fuzz/transformation_add_dead_break_test.cpp
index 5b92ac3..5302d8a 100644
--- a/test/fuzz/transformation_add_dead_break_test.cpp
+++ b/test/fuzz/transformation_add_dead_break_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_dead_break.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -98,8 +100,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   const uint32_t merge_block = 16;
@@ -152,37 +155,43 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -343,9 +352,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // The header and merge blocks
@@ -437,49 +446,57 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation7.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation7, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation8.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation8, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -712,9 +729,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // The header and merge blocks
@@ -829,61 +846,71 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation7.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation7, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation8.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation8, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation9.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation9, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation10.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation10, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1142,9 +1169,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // The header and merge blocks
@@ -1264,43 +1291,50 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation7.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation7, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1484,9 +1518,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Not OK to break loop from its continue construct, except from the back-edge
@@ -1545,9 +1579,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationAddDeadBreak(18, 21, true, {});
@@ -1596,7 +1630,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -1677,9 +1712,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   const uint32_t loop_merge = 12;
@@ -1715,25 +1750,29 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1897,9 +1936,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   const uint32_t outer_loop_merge = 34;
@@ -1924,13 +1963,15 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -2118,9 +2159,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Some inapplicable transformations
@@ -2163,31 +2204,36 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -2312,9 +2358,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(100, 101, false, {});
@@ -2367,9 +2413,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(102, 101, false, {});
@@ -2416,9 +2462,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto good_transformation = TransformationAddDeadBreak(100, 101, false, {11});
@@ -2427,7 +2473,8 @@
 
   ApplyAndCheckFreshIds(good_transformation, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -2507,9 +2554,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto good_transformation = TransformationAddDeadBreak(102, 101, false, {11});
@@ -2518,7 +2565,8 @@
 
   ApplyAndCheckFreshIds(good_transformation, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -2592,9 +2640,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(100, 101, false, {});
@@ -2651,9 +2699,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(102, 101, false, {});
@@ -2712,9 +2760,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(102, 101, false, {});
@@ -2760,9 +2808,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadBreak(102, 101, false, {});
@@ -2808,9 +2856,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad because 14 comes before 12 in the module, and 14 has no predecessors.
diff --git a/test/fuzz/transformation_add_dead_continue_test.cpp b/test/fuzz/transformation_add_dead_continue_test.cpp
index effd22b..577f427 100644
--- a/test/fuzz/transformation_add_dead_continue_test.cpp
+++ b/test/fuzz/transformation_add_dead_continue_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_dead_continue.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -96,8 +98,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // These are all possibilities.
@@ -144,19 +147,22 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -370,9 +376,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   std::vector<uint32_t> good = {6, 7, 18, 20, 34, 40, 45, 46, 47, 56, 57};
@@ -609,9 +615,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   std::vector<uint32_t> good = {32, 33, 46, 52, 101};
@@ -819,9 +825,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   std::vector<uint32_t> bad = {5, 19, 20, 23, 31, 32, 33, 70};
@@ -995,9 +1001,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // This transformation is not applicable because the dead continue from the
@@ -1112,9 +1118,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // This transformation would shortcut the part of the loop body that defines
@@ -1162,9 +1168,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // This transformation would shortcut the part of the loop body that defines
@@ -1303,9 +1309,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // This transformation would shortcut the part of the loop body that defines
@@ -1371,9 +1377,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // This transformation would introduce a branch from a continue target to
@@ -1431,9 +1437,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadContinue(299, false, {});
@@ -1493,9 +1499,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadContinue(10, false, {});
@@ -1547,9 +1553,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadContinue(110, true, {});
@@ -1594,9 +1600,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_transformation = TransformationAddDeadContinue(10, true, {});
diff --git a/test/fuzz/transformation_add_early_terminator_wrapper_test.cpp b/test/fuzz/transformation_add_early_terminator_wrapper_test.cpp
index 8006770..8239e21 100644
--- a/test/fuzz/transformation_add_early_terminator_wrapper_test.cpp
+++ b/test/fuzz/transformation_add_early_terminator_wrapper_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_early_terminator_wrapper.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -32,9 +34,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -55,9 +57,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -85,9 +87,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -123,7 +125,8 @@
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_function_test.cpp b/test/fuzz/transformation_add_function_test.cpp
index 849036a..d55fb93 100644
--- a/test/fuzz/transformation_add_function_test.cpp
+++ b/test/fuzz/transformation_add_function_test.cpp
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 #include "source/fuzz/transformation_add_function.h"
+
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_message.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -39,7 +42,10 @@
   std::vector<protobufs::Instruction> result;
   const auto donor_context =
       BuildModule(env, consumer, donor, kFuzzAssembleOption);
-  assert(IsValid(env, donor_context.get()) && "The given donor must be valid.");
+  spvtools::ValidatorOptions validator_options;
+  assert(fuzzerutil::IsValidAndWellFormed(
+             donor_context.get(), validator_options, kConsoleMessageConsumer) &&
+         "The given donor must be valid.");
   for (auto& function : *donor_context->module()) {
     if (function.result_id() == function_id) {
       function.ForEachInst([&result](opt::Instruction* inst) {
@@ -142,9 +148,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationAddFunction transformation1(std::vector<protobufs::Instruction>(
@@ -220,7 +226,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation1 = R"(
                OpCapability Shader
@@ -342,7 +349,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation2 = R"(
                OpCapability Shader
@@ -491,9 +499,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // No instructions
@@ -629,11 +637,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpReturn, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -644,7 +654,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The added function should not be deemed livesafe.
   ASSERT_FALSE(
       transformation_context1.GetFactManager()->FunctionIsLivesafe(30));
@@ -730,7 +741,8 @@
                                                  transformation_context2));
   ApplyAndCheckFreshIds(add_livesafe_function, context2.get(),
                         &transformation_context2);
-  ASSERT_TRUE(IsValid(env, context2.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context2.get(), validator_options, kConsoleMessageConsumer));
   // The added function should indeed be deemed livesafe.
   ASSERT_TRUE(transformation_context2.GetFactManager()->FunctionIsLivesafe(30));
   // All variables/parameters in the function should be deemed irrelevant,
@@ -851,11 +863,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpKill, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -866,7 +880,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The added function should not be deemed livesafe.
   ASSERT_FALSE(
       transformation_context1.GetFactManager()->FunctionIsLivesafe(10));
@@ -913,7 +928,8 @@
                                                  transformation_context2));
   ApplyAndCheckFreshIds(add_livesafe_function, context2.get(),
                         &transformation_context2);
-  ASSERT_TRUE(IsValid(env, context2.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context2.get(), validator_options, kConsoleMessageConsumer));
   // The added function should indeed be deemed livesafe.
   ASSERT_TRUE(transformation_context2.GetFactManager()->FunctionIsLivesafe(10));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1006,11 +1022,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpKill, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -1021,7 +1039,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The added function should not be deemed livesafe.
   ASSERT_FALSE(
       transformation_context1.GetFactManager()->FunctionIsLivesafe(10));
@@ -1069,7 +1088,8 @@
                                                  transformation_context2));
   ApplyAndCheckFreshIds(add_livesafe_function, context2.get(),
                         &transformation_context2);
-  ASSERT_TRUE(IsValid(env, context2.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context2.get(), validator_options, kConsoleMessageConsumer));
   // The added function should indeed be deemed livesafe.
   ASSERT_TRUE(transformation_context2.GetFactManager()->FunctionIsLivesafe(10));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1293,11 +1313,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpReturn, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -1308,7 +1330,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The function should not be deemed livesafe
   ASSERT_FALSE(
       transformation_context1.GetFactManager()->FunctionIsLivesafe(12));
@@ -1449,7 +1472,8 @@
                                                  transformation_context2));
   ApplyAndCheckFreshIds(add_livesafe_function, context2.get(),
                         &transformation_context2);
-  ASSERT_TRUE(IsValid(env, context2.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context2.get(), validator_options, kConsoleMessageConsumer));
   // The function should be deemed livesafe
   ASSERT_TRUE(transformation_context2.GetFactManager()->FunctionIsLivesafe(12));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1620,11 +1644,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpReturn, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -1638,7 +1664,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The function should not be deemed livesafe
   ASSERT_FALSE(transformation_context1.GetFactManager()->FunctionIsLivesafe(8));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1676,7 +1703,8 @@
                                                  transformation_context2));
   ApplyAndCheckFreshIds(add_livesafe_function, context2.get(),
                         &transformation_context2);
-  ASSERT_TRUE(IsValid(env, context2.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context2.get(), validator_options, kConsoleMessageConsumer));
   // The function should be deemed livesafe
   ASSERT_TRUE(transformation_context2.GetFactManager()->FunctionIsLivesafe(8));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1720,11 +1748,13 @@
   instructions.push_back(MakeInstructionMessage(SpvOpReturn, 0, 0, {}));
   instructions.push_back(MakeInstructionMessage(SpvOpFunctionEnd, 0, 0, {}));
 
+  spvtools::ValidatorOptions validator_options;
+
   const auto context1 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   const auto context2 = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
 
-  spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context1(
       MakeUnique<FactManager>(context1.get()), validator_options);
   TransformationContext transformation_context2(
@@ -1735,7 +1765,8 @@
       add_dead_function.IsApplicable(context1.get(), transformation_context1));
   ApplyAndCheckFreshIds(add_dead_function, context1.get(),
                         &transformation_context1);
-  ASSERT_TRUE(IsValid(env, context1.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+      context1.get(), validator_options, kConsoleMessageConsumer));
   // The function should not be deemed livesafe
   ASSERT_FALSE(transformation_context1.GetFactManager()->FunctionIsLivesafe(8));
   // All variables/parameters in the function should be deemed irrelevant.
@@ -1851,9 +1882,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -1873,7 +1904,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(add_livesafe_function, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2007,9 +2039,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -2029,7 +2061,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(add_livesafe_function, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2161,9 +2194,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -2183,7 +2216,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(add_livesafe_function, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2307,9 +2341,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -2419,9 +2453,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -2441,7 +2475,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(add_livesafe_function, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2583,9 +2618,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %8 in
@@ -2616,7 +2651,8 @@
       with_op_phi_data.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(with_op_phi_data, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2774,9 +2810,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %8 in
@@ -2796,7 +2832,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -2922,9 +2959,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a sequence of instruction messages corresponding to function %6 in
@@ -2938,7 +2975,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(add_livesafe_function, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
diff --git a/test/fuzz/transformation_add_global_undef_test.cpp b/test/fuzz/transformation_add_global_undef_test.cpp
index 7da0cda..c3a49e4 100644
--- a/test/fuzz/transformation_add_global_undef_test.cpp
+++ b/test/fuzz/transformation_add_global_undef_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_global_undef.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -45,9 +47,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -86,7 +88,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_global_variable_test.cpp b/test/fuzz/transformation_add_global_variable_test.cpp
index f08ab47..eb958a7 100644
--- a/test/fuzz/transformation_add_global_variable_test.cpp
+++ b/test/fuzz/transformation_add_global_variable_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_global_variable.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -58,9 +60,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -160,7 +162,8 @@
   ASSERT_FALSE(
       transformation_context.GetFactManager()->PointeeValueIsIrrelevant(105));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -246,9 +249,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationAddGlobalVariable transformations[] = {
@@ -276,7 +279,8 @@
       transformation_context.GetFactManager()->PointeeValueIsIrrelevant(102));
   ASSERT_FALSE(
       transformation_context.GetFactManager()->PointeeValueIsIrrelevant(101));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -342,9 +346,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 #ifndef NDEBUG
@@ -373,7 +377,8 @@
       transformation_context.GetFactManager()->PointeeValueIsIrrelevant(8));
   ASSERT_FALSE(
       transformation_context.GetFactManager()->PointeeValueIsIrrelevant(10));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_image_sample_unused_components_test.cpp b/test/fuzz/transformation_add_image_sample_unused_components_test.cpp
index 008789b..072378c 100644
--- a/test/fuzz/transformation_add_image_sample_unused_components_test.cpp
+++ b/test/fuzz/transformation_add_image_sample_unused_components_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_image_sample_unused_components.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -64,9 +66,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests applicable image instruction.
@@ -190,9 +192,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
diff --git a/test/fuzz/transformation_add_local_variable_test.cpp b/test/fuzz/transformation_add_local_variable_test.cpp
index 97ba9e9..ed57a28 100644
--- a/test/fuzz/transformation_add_local_variable_test.cpp
+++ b/test/fuzz/transformation_add_local_variable_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_local_variable.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -77,9 +79,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // A few cases of inapplicable transformations:
diff --git a/test/fuzz/transformation_add_loop_preheader_test.cpp b/test/fuzz/transformation_add_loop_preheader_test.cpp
index 0d0ac22..1634494 100644
--- a/test/fuzz/transformation_add_loop_preheader_test.cpp
+++ b/test/fuzz/transformation_add_loop_preheader_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_loop_preheader.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -70,7 +72,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %9 is not a loop header
   ASSERT_FALSE(TransformationAddLoopPreheader(9, 15, {}).IsApplicable(
@@ -97,7 +100,8 @@
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -201,7 +205,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation1 = TransformationAddLoopPreheader(8, 40, {});
   ASSERT_TRUE(
@@ -231,7 +236,8 @@
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_loop_to_create_int_constant_synonym_test.cpp b/test/fuzz/transformation_add_loop_to_create_int_constant_synonym_test.cpp
index 7245453..d2d9b4d 100644
--- a/test/fuzz/transformation_add_loop_to_create_int_constant_synonym_test.cpp
+++ b/test/fuzz/transformation_add_loop_to_create_int_constant_synonym_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_loop_to_create_int_constant_synonym.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -74,9 +76,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Reminder: the first four parameters of the constructor are the constants
@@ -183,9 +185,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     ASSERT_FALSE(TransformationAddLoopToCreateIntConstantSynonym(
@@ -222,9 +224,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     ASSERT_FALSE(TransformationAddLoopToCreateIntConstantSynonym(
@@ -261,9 +263,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     ASSERT_FALSE(TransformationAddLoopToCreateIntConstantSynonym(
@@ -327,9 +329,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Block %14 has no predecessors.
@@ -393,7 +395,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(100, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // This transformation will create a synonym of constant %12 from a 2-block
   // loop.
@@ -405,7 +408,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(107, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // This transformation will create a synonym of constant %12 from a 2-block
   // loop.
@@ -417,7 +421,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(115, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -552,9 +557,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // These tests check that the transformation is applicable and is applied
@@ -569,7 +574,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(100, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %12 and %11 are signed integers, %18 is an unsigned integer.
   auto transformation2 = TransformationAddLoopToCreateIntConstantSynonym(
@@ -580,7 +586,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(108, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %17, %18 and %16 are all signed integers.
   auto transformation3 = TransformationAddLoopToCreateIntConstantSynonym(
@@ -591,7 +598,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(17, {}), MakeDataDescriptor(115, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %22 is an unsigned integer vector, %23 and %24 are signed integer vectors.
   auto transformation4 = TransformationAddLoopToCreateIntConstantSynonym(
@@ -602,7 +610,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(22, {}), MakeDataDescriptor(122, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %21, %23 and %24 are all signed integer vectors.
   auto transformation5 = TransformationAddLoopToCreateIntConstantSynonym(
@@ -613,7 +622,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(21, {}), MakeDataDescriptor(129, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -746,9 +756,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // These tests check that the transformation can be applied, and is applied
@@ -763,7 +773,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(13, {}), MakeDataDescriptor(100, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // 64-bit vector integers.
   auto transformation2 = TransformationAddLoopToCreateIntConstantSynonym(
@@ -774,7 +785,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(16, {}), MakeDataDescriptor(107, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -865,9 +877,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // These tests check that underflows are taken into consideration when
@@ -883,7 +895,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {}), MakeDataDescriptor(100, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Subtracting 20 twice from 0 underflows and gives the unsigned integer
   // 4294967256.
@@ -895,7 +908,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(15, {}), MakeDataDescriptor(107, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -988,9 +1002,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(15);
@@ -1054,9 +1068,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1068,7 +1082,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(20, {}), MakeDataDescriptor(100, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationAddLoopToCreateIntConstantSynonym(
       20, 21, 20, 20, 8, 200, 201, 202, 203, 204, 205, 206, 0);
@@ -1078,7 +1093,8 @@
                         &transformation_context);
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(20, {}), MakeDataDescriptor(200, {})));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_no_contraction_decoration_test.cpp b/test/fuzz/transformation_add_no_contraction_decoration_test.cpp
index 01ea3af..4fc9d2d 100644
--- a/test/fuzz/transformation_add_no_contraction_decoration_test.cpp
+++ b/test/fuzz/transformation_add_no_contraction_decoration_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_no_contraction_decoration.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -93,8 +95,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Invalid: 200 is not an id
@@ -115,7 +118,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_add_opphi_synonym_test.cpp b/test/fuzz/transformation_add_opphi_synonym_test.cpp
index 7cf073b..3501f8e 100644
--- a/test/fuzz/transformation_add_opphi_synonym_test.cpp
+++ b/test/fuzz/transformation_add_opphi_synonym_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_opphi_synonym.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -83,9 +85,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIdSynonyms(transformation_context.GetFactManager());
@@ -204,9 +206,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIdSynonyms(transformation_context.GetFactManager());
@@ -249,7 +251,8 @@
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(103, {}), MakeDataDescriptor(9, {})));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -351,9 +354,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Declare synonyms
@@ -461,9 +464,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Dead blocks
diff --git a/test/fuzz/transformation_add_parameter_test.cpp b/test/fuzz/transformation_add_parameter_test.cpp
index 1e22eca..7b2a15f 100644
--- a/test/fuzz/transformation_add_parameter_test.cpp
+++ b/test/fuzz/transformation_add_parameter_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_parameter.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -100,9 +102,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Can't modify entry point function.
@@ -134,28 +136,32 @@
     TransformationAddParameter correct(9, 60, 11, {{{13, 8}}}, 61);
     ASSERT_TRUE(correct.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(correct, context.get(), &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(60));
   }
   {
     TransformationAddParameter correct(17, 62, 7, {{}}, 63);
     ASSERT_TRUE(correct.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(correct, context.get(), &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(62));
   }
   {
     TransformationAddParameter correct(29, 64, 31, {{}}, 65);
     ASSERT_TRUE(correct.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(correct, context.get(), &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(64));
   }
   {
     TransformationAddParameter correct(34, 66, 7, {{}}, 67);
     ASSERT_TRUE(correct.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(correct, context.get(), &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(66));
   }
 
@@ -318,9 +324,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: Id 19 is not available in the caller that has id 34.
@@ -443,9 +449,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: Pointer of id 61 has storage class Output, which is not supported.
@@ -462,7 +468,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Local variable of id 34 is defined in the caller (main).
   TransformationAddParameter transformation_good_2(14, 52, 9, {{{43, 34}}}, 53);
@@ -470,7 +477,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Local variable of id 39 is defined in the caller (main).
   TransformationAddParameter transformation_good_3(6, 54, 9, {{{33, 39}}}, 55);
@@ -478,7 +486,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: This adds another pointer parameter to the function of id 6.
   TransformationAddParameter transformation_good_4(6, 56, 30, {{{33, 31}}}, 57);
@@ -486,7 +495,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -664,9 +674,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Good: Global variable of id 28 (storage class Private) is defined in the
@@ -677,7 +687,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Global variable of id 61 is (storage class Workgroup) is defined in
   // the caller (main).
@@ -695,7 +706,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Global variable of id 61 is (storage class Workgroup) is defined in
   // the caller (main).
@@ -713,7 +725,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Global variable of id 61 is (storage class Workgroup) is defined in
   // the caller (main).
@@ -723,7 +736,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -881,9 +895,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Good: Local variable of id 21 is defined in every caller (id 27 and id 31).
@@ -893,7 +907,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Good: Local variable of id 28 is defined in every caller (id 27 and id 31).
   TransformationAddParameter transformation_good_2(
@@ -902,7 +917,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
               OpCapability Shader
@@ -1037,9 +1053,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationAddParameter transformation_good_1(10, 70, 7,
@@ -1048,7 +1064,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Check if the fact PointeeValueIsIrrelevant is set for the new parameter
   // (storage class Function).
@@ -1061,7 +1078,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Check if the fact PointeeValueIsIrrelevant is set for the new parameter
   // (storage class Private).
@@ -1074,7 +1092,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Check if the fact PointeeValueIsIrrelevant is set for the new parameter
   // (storage class Workgroup).
diff --git a/test/fuzz/transformation_add_relaxed_decoration_test.cpp b/test/fuzz/transformation_add_relaxed_decoration_test.cpp
index 4c86d8c..c440882 100644
--- a/test/fuzz/transformation_add_relaxed_decoration_test.cpp
+++ b/test/fuzz/transformation_add_relaxed_decoration_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_relaxed_decoration.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -65,9 +67,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(100);
@@ -92,7 +94,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_add_synonym_test.cpp b/test/fuzz/transformation_add_synonym_test.cpp
index bac0ee0..3803fa3 100644
--- a/test/fuzz/transformation_add_synonym_test.cpp
+++ b/test/fuzz/transformation_add_synonym_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_synonym.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -68,9 +70,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(24);
@@ -204,9 +206,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(5, SpvOpReturn, 0);
@@ -340,9 +342,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(5, SpvOpReturn, 0);
@@ -433,9 +435,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(5, SpvOpReturn, 0);
@@ -471,9 +473,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(5, SpvOpReturn, 0);
@@ -529,9 +531,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(5, SpvOpReturn, 0);
@@ -625,9 +627,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_EQ(0, transformation_context.GetFactManager()
@@ -933,9 +935,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Inapplicable because %18 is decorated.
@@ -1126,9 +1128,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   std::vector<TransformationAddSynonym> transformations = {
@@ -1161,7 +1163,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1235,9 +1238,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Illegal to copy null.
@@ -1279,9 +1282,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(8);
diff --git a/test/fuzz/transformation_add_type_array_test.cpp b/test/fuzz/transformation_add_type_array_test.cpp
index c66736f..ab4ed9a 100644
--- a/test/fuzz/transformation_add_type_array_test.cpp
+++ b/test/fuzz/transformation_add_type_array_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_array.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -52,9 +54,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -101,7 +103,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_type_boolean_test.cpp b/test/fuzz/transformation_add_type_boolean_test.cpp
index 53bb92c..88d9f5b 100644
--- a/test/fuzz/transformation_add_type_boolean_test.cpp
+++ b/test/fuzz/transformation_add_type_boolean_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_boolean.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -40,9 +42,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Not applicable because id 1 is already in use.
@@ -53,7 +55,8 @@
   ASSERT_TRUE(
       add_type_bool.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(add_type_bool, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Not applicable as we already have this type now.
   ASSERT_FALSE(TransformationAddTypeBoolean(101).IsApplicable(
diff --git a/test/fuzz/transformation_add_type_float_test.cpp b/test/fuzz/transformation_add_type_float_test.cpp
index 858d30f..235d61b 100644
--- a/test/fuzz/transformation_add_type_float_test.cpp
+++ b/test/fuzz/transformation_add_type_float_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_float.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -44,9 +46,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests non-fresh id.
@@ -94,9 +96,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Adds 16-bit float type.
@@ -133,7 +135,8 @@
          OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
diff --git a/test/fuzz/transformation_add_type_function_test.cpp b/test/fuzz/transformation_add_type_function_test.cpp
index 1ecf283..5d9ea47 100644
--- a/test/fuzz/transformation_add_type_function_test.cpp
+++ b/test/fuzz/transformation_add_type_function_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_function.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -57,9 +59,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -93,7 +95,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_type_int_test.cpp b/test/fuzz/transformation_add_type_int_test.cpp
index 6a6b492..ee4e799 100644
--- a/test/fuzz/transformation_add_type_int_test.cpp
+++ b/test/fuzz/transformation_add_type_int_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_int.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -44,9 +46,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests non-fresh id.
@@ -110,9 +112,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Adds signed 8-bit integer type.
@@ -175,7 +177,8 @@
          OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
diff --git a/test/fuzz/transformation_add_type_matrix_test.cpp b/test/fuzz/transformation_add_type_matrix_test.cpp
index 15422e4..926e983 100644
--- a/test/fuzz/transformation_add_type_matrix_test.cpp
+++ b/test/fuzz/transformation_add_type_matrix_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_matrix.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -45,9 +47,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -95,7 +97,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_add_type_pointer_test.cpp b/test/fuzz/transformation_add_type_pointer_test.cpp
index 921516a..985e904 100644
--- a/test/fuzz/transformation_add_type_pointer_test.cpp
+++ b/test/fuzz/transformation_add_type_pointer_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_pointer.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -95,9 +97,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto bad_type_id_does_not_exist =
@@ -142,7 +144,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_add_type_struct_test.cpp b/test/fuzz/transformation_add_type_struct_test.cpp
index 9d2777e..b57bab2 100644
--- a/test/fuzz/transformation_add_type_struct_test.cpp
+++ b/test/fuzz/transformation_add_type_struct_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_struct.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -45,9 +47,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -80,7 +82,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -136,9 +139,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // From the spec for the BuiltIn decoration:
diff --git a/test/fuzz/transformation_add_type_vector_test.cpp b/test/fuzz/transformation_add_type_vector_test.cpp
index 9ed8d53..a49ba6e 100644
--- a/test/fuzz/transformation_add_type_vector_test.cpp
+++ b/test/fuzz/transformation_add_type_vector_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_add_type_vector.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -43,9 +45,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id already in use
@@ -74,7 +76,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_adjust_branch_weights_test.cpp b/test/fuzz/transformation_adjust_branch_weights_test.cpp
index 0a17749..1bf2c59 100644
--- a/test/fuzz/transformation_adjust_branch_weights_test.cpp
+++ b/test/fuzz/transformation_adjust_branch_weights_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_adjust_branch_weights.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -99,9 +101,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests OpBranchConditional instruction with weigths.
@@ -247,9 +249,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
diff --git a/test/fuzz/transformation_composite_construct_test.cpp b/test/fuzz/transformation_composite_construct_test.cpp
index eed73b4..6f67f6d 100644
--- a/test/fuzz/transformation_composite_construct_test.cpp
+++ b/test/fuzz/transformation_composite_construct_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_composite_construct.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/data_descriptor.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -127,9 +129,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Make a vec2[3]
@@ -146,7 +148,8 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_vec2_array_length_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(41, {}), MakeDataDescriptor(200, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -166,7 +169,8 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_float_array_length_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(24, {}), MakeDataDescriptor(201, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -186,7 +190,8 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_bool_array_length_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(33, {}), MakeDataDescriptor(202, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -206,7 +211,8 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_uvec3_array_length_2_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(69, {}), MakeDataDescriptor(203, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -395,9 +401,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // make a mat3x4
@@ -410,7 +416,8 @@
   ASSERT_FALSE(
       make_mat34_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_mat34, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(25, {}), MakeDataDescriptor(200, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -428,7 +435,8 @@
   ASSERT_FALSE(
       make_mat43_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_mat43, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(11, {}), MakeDataDescriptor(201, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -606,9 +614,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // make an Inner
@@ -621,7 +629,8 @@
   ASSERT_FALSE(
       make_inner_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_inner, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(25, {}), MakeDataDescriptor(200, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -639,7 +648,8 @@
   ASSERT_FALSE(
       make_outer_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_outer, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(46, {}), MakeDataDescriptor(201, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -928,9 +938,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationCompositeConstruct make_vec2(
@@ -942,7 +952,8 @@
   ASSERT_FALSE(
       make_vec2_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_vec2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(17, {}), MakeDataDescriptor(200, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -959,7 +970,8 @@
   ASSERT_FALSE(
       make_vec3_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_vec3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {0}), MakeDataDescriptor(201, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -978,7 +990,8 @@
   ASSERT_FALSE(
       make_vec4_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_vec4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(32, {}), MakeDataDescriptor(202, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -997,7 +1010,8 @@
   ASSERT_FALSE(
       make_ivec2_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_ivec2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(126, {}), MakeDataDescriptor(203, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1014,7 +1028,8 @@
   ASSERT_FALSE(
       make_ivec3_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_ivec3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(56, {}), MakeDataDescriptor(204, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1033,7 +1048,8 @@
   ASSERT_FALSE(
       make_ivec4_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_ivec4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(56, {}), MakeDataDescriptor(205, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1051,7 +1067,8 @@
   ASSERT_FALSE(
       make_uvec2_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_uvec2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(18, {}), MakeDataDescriptor(206, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1066,7 +1083,8 @@
   ASSERT_FALSE(
       make_uvec3_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_uvec3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(14, {}), MakeDataDescriptor(207, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1085,7 +1103,8 @@
   ASSERT_FALSE(
       make_uvec4_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_uvec4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(14, {}), MakeDataDescriptor(208, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1114,7 +1133,8 @@
   ASSERT_FALSE(
       make_bvec2_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_bvec2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(111, {}), MakeDataDescriptor(209, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1129,7 +1149,8 @@
   ASSERT_FALSE(
       make_bvec3_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_bvec3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(108, {0}), MakeDataDescriptor(210, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1146,7 +1167,8 @@
   ASSERT_FALSE(
       make_bvec4_bad.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(make_bvec4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(108, {0}), MakeDataDescriptor(211, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1420,9 +1442,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationCompositeConstruct transformation(
@@ -1430,7 +1452,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(25, {}), MakeDataDescriptor(200, {0})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -1502,9 +1525,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(25);
@@ -1514,7 +1537,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(25, {}), MakeDataDescriptor(200, {0})));
   // Even though %28 is not irrelevant, we do not create a synonym because part
@@ -1557,9 +1581,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(15);
diff --git a/test/fuzz/transformation_composite_extract_test.cpp b/test/fuzz/transformation_composite_extract_test.cpp
index 2aa8322..1ee62f5 100644
--- a/test/fuzz/transformation_composite_extract_test.cpp
+++ b/test/fuzz/transformation_composite_extract_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_composite_extract.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -94,9 +96,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Instruction does not exist.
@@ -144,7 +146,8 @@
       transformation_1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationCompositeExtract transformation_2(
       MakeInstructionDescriptor(37, SpvOpAccessChain, 0), 202, 104, {0, 2});
@@ -152,7 +155,8 @@
       transformation_2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationCompositeExtract transformation_3(
       MakeInstructionDescriptor(29, SpvOpAccessChain, 0), 203, 104, {0});
@@ -160,7 +164,8 @@
       transformation_3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationCompositeExtract transformation_4(
       MakeInstructionDescriptor(24, SpvOpStore, 0), 204, 101, {0});
@@ -168,7 +173,8 @@
       transformation_4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationCompositeExtract transformation_5(
       MakeInstructionDescriptor(29, SpvOpBranch, 0), 205, 102, {2});
@@ -176,7 +182,8 @@
       transformation_5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationCompositeExtract transformation_6(
       MakeInstructionDescriptor(37, SpvOpReturn, 0), 206, 103, {1});
@@ -184,7 +191,8 @@
       transformation_6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation_6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(201, {}), MakeDataDescriptor(100, {2})));
@@ -353,9 +361,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Cannot insert before the OpVariables of a function.
@@ -475,9 +483,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationCompositeExtract transformation(
@@ -562,9 +570,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(100);
@@ -611,9 +619,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(15);
diff --git a/test/fuzz/transformation_composite_insert_test.cpp b/test/fuzz/transformation_composite_insert_test.cpp
index 4468786..3b6f34d 100644
--- a/test/fuzz/transformation_composite_insert_test.cpp
+++ b/test/fuzz/transformation_composite_insert_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_composite_insert.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/data_descriptor.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -94,9 +96,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: |fresh_id| is not fresh.
@@ -213,9 +215,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: The composite with |composite_id| cannot be empty.
@@ -232,7 +234,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -356,8 +359,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add fact that the composite is irrelevant.
@@ -369,7 +373,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // No synonyms that involve the original object - %30 - should have been
   // added.
@@ -459,8 +464,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add fact that the object is irrelevant.
@@ -472,7 +478,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Since %30 and %50 are not irrelevant, they should be synonymous at all
   // indices unaffected by the insertion.
@@ -567,8 +574,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation_good_1 = TransformationCompositeInsert(
@@ -577,7 +585,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // These synonyms should have been added.
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -605,7 +614,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // These synonyms should have been added.
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -769,9 +779,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: The object with |object_id| is not available at
@@ -841,9 +851,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -901,7 +911,8 @@
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(103, {1}), MakeDataDescriptor(9, {1})));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 }
 
 }  // namespace
diff --git a/test/fuzz/transformation_compute_data_synonym_fact_closure_test.cpp b/test/fuzz/transformation_compute_data_synonym_fact_closure_test.cpp
index 1fc66e2..7a36c5c 100644
--- a/test/fuzz/transformation_compute_data_synonym_fact_closure_test.cpp
+++ b/test/fuzz/transformation_compute_data_synonym_fact_closure_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_compute_data_synonym_fact_closure.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -121,9 +123,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_TRUE(TransformationComputeDataSynonymFactClosure(100).IsApplicable(
@@ -404,9 +406,10 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
+
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
diff --git a/test/fuzz/transformation_duplicate_region_with_selection_test.cpp b/test/fuzz/transformation_duplicate_region_with_selection_test.cpp
index 8ef4602..98b81f8 100644
--- a/test/fuzz/transformation_duplicate_region_with_selection_test.cpp
+++ b/test/fuzz/transformation_duplicate_region_with_selection_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_duplicate_region_with_selection.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -77,9 +79,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationDuplicateRegionWithSelection transformation_good_1 =
@@ -92,7 +94,8 @@
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string expected_shader = R"(
                OpCapability Shader
                OpCapability VariablePointers
@@ -208,9 +211,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationDuplicateRegionWithSelection transformation_good_1 =
@@ -223,7 +226,8 @@
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
    OpCapability Shader
@@ -346,9 +350,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: |entry_block_id| refers to the entry block of the function (this
@@ -442,9 +446,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: A value in the |original_label_to_duplicate_label| is not a fresh id.
@@ -615,9 +619,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: The exit block cannot be a header of a loop, because the region won't
@@ -697,9 +701,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: The block with id 7, which is not an exit block, has two successors:
@@ -781,9 +785,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationDuplicateRegionWithSelection transformation_good_1 =
@@ -808,7 +812,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                  OpCapability Shader
@@ -969,12 +974,13 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationDuplicateRegionWithSelection transformation_good_1 =
       TransformationDuplicateRegionWithSelection(
@@ -985,7 +991,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1123,9 +1130,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: The block with id 50, which is the entry block, has two successors:
@@ -1200,12 +1207,13 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationDuplicateRegionWithSelection transformation_good_1 =
       TransformationDuplicateRegionWithSelection(
@@ -1214,7 +1222,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1336,9 +1345,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad: There is no required capability CapabilityVariablePointers
@@ -1396,12 +1405,13 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationDuplicateRegionWithSelection transformation_good_1 =
       TransformationDuplicateRegionWithSelection(
@@ -1411,7 +1421,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1515,12 +1526,13 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationDuplicateRegionWithSelection transformation_good_1 =
       TransformationDuplicateRegionWithSelection(
@@ -1530,7 +1542,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1653,9 +1666,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationDuplicateRegionWithSelection transformation_bad =
@@ -1731,9 +1744,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1792,15 +1805,16 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   auto overflow_ids_unique_ptr = MakeUnique<CounterOverflowIdSource>(1000);
   auto overflow_ids_ptr = overflow_ids_unique_ptr.get();
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options,
       std::move(overflow_ids_unique_ptr));
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // The mappings do not provide sufficient ids, thus overflow ids are required.
   TransformationDuplicateRegionWithSelection transformation_good_1 =
@@ -1811,7 +1825,8 @@
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context,
                         overflow_ids_ptr->GetIssuedOverflowIds());
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1921,12 +1936,13 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   TransformationDuplicateRegionWithSelection transformation_good_1 =
       TransformationDuplicateRegionWithSelection(
@@ -1936,7 +1952,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_equation_instruction_test.cpp b/test/fuzz/transformation_equation_instruction_test.cpp
index 9b9b0a0..e937588 100644
--- a/test/fuzz/transformation_equation_instruction_test.cpp
+++ b/test/fuzz/transformation_equation_instruction_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_equation_instruction.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -46,9 +48,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -102,7 +104,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       15, SpvOpSNegate, {14}, return_instruction);
@@ -110,7 +113,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(15, {}), MakeDataDescriptor(7, {})));
@@ -164,9 +168,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -193,7 +197,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       15, SpvOpLogicalNot, {14}, return_instruction);
@@ -201,7 +206,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(15, {}), MakeDataDescriptor(7, {})));
@@ -256,9 +262,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -291,7 +297,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       19, SpvOpISub, {14, 16}, return_instruction);
@@ -299,7 +306,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(15, {}), MakeDataDescriptor(19, {})));
 
@@ -309,7 +317,8 @@
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(20, {}), MakeDataDescriptor(16, {})));
 
@@ -319,7 +328,8 @@
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation5 = TransformationEquationInstruction(
       24, SpvOpSNegate, {22}, return_instruction);
@@ -327,7 +337,8 @@
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(24, {}), MakeDataDescriptor(15, {})));
 
@@ -383,9 +394,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -397,7 +408,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       17, SpvOpIAdd, {14, 16}, return_instruction);
@@ -405,7 +417,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(17, {}), MakeDataDescriptor(15, {})));
 
@@ -415,7 +428,8 @@
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(17, {}), MakeDataDescriptor(18, {})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -427,7 +441,8 @@
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation5 = TransformationEquationInstruction(
       20, SpvOpSNegate, {19}, return_instruction);
@@ -435,7 +450,8 @@
       transformation5.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(20, {}), MakeDataDescriptor(16, {})));
 
@@ -445,7 +461,8 @@
       transformation6.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(21, {}), MakeDataDescriptor(15, {})));
 
@@ -455,7 +472,8 @@
       transformation7.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation7, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation8 = TransformationEquationInstruction(
       23, SpvOpSNegate, {22}, return_instruction);
@@ -463,7 +481,8 @@
       transformation8.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation8, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(23, {}), MakeDataDescriptor(16, {})));
 
@@ -531,9 +550,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -655,9 +674,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -702,9 +721,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -745,9 +764,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -820,9 +839,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -894,9 +913,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -914,7 +933,8 @@
       TransformationEquationInstruction(51, SpvOpBitcast, {20}, insert_before)
           .IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -964,9 +984,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -984,7 +1004,8 @@
       TransformationEquationInstruction(51, SpvOpBitcast, {20}, insert_before)
           .IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1036,9 +1057,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -1060,7 +1081,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1115,9 +1137,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto insert_before = MakeInstructionDescriptor(13, SpvOpReturn, 0);
@@ -1139,7 +1161,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -1189,9 +1212,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -1203,7 +1226,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       570, SpvOpIAdd, {522, 113}, return_instruction);
@@ -1211,7 +1235,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1259,9 +1284,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -1273,7 +1298,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation2 = TransformationEquationInstruction(
       570, SpvOpIAdd, {522, 113}, return_instruction);
@@ -1281,7 +1307,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1343,9 +1370,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -1446,7 +1473,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -1517,9 +1545,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::InstructionDescriptor return_instruction =
@@ -1568,9 +1596,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto return_instruction = MakeInstructionDescriptor(13, SpvOpReturn, 0);
diff --git a/test/fuzz/transformation_flatten_conditional_branch_test.cpp b/test/fuzz/transformation_flatten_conditional_branch_test.cpp
index 1bb8ee8..fddfdaf 100644
--- a/test/fuzz/transformation_flatten_conditional_branch_test.cpp
+++ b/test/fuzz/transformation_flatten_conditional_branch_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_flatten_conditional_branch.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -137,9 +139,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Block %15 does not end with OpBranchConditional.
@@ -243,9 +245,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation1 = TransformationFlattenConditionalBranch(7, true, {});
@@ -272,7 +274,8 @@
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -417,9 +420,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 #ifndef NDEBUG
@@ -515,7 +518,8 @@
                         &new_transformation_context,
                         overflow_ids_ptr->GetIssuedOverflowIds());
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -693,9 +697,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 #ifndef NDEBUG
@@ -735,7 +739,8 @@
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -826,9 +831,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -836,7 +841,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -891,9 +897,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -901,7 +907,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -958,9 +965,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -968,7 +975,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1027,9 +1035,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1037,7 +1045,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1101,9 +1110,10 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
+
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1116,7 +1126,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1205,9 +1216,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1218,7 +1229,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 }
 
 }  // namespace
diff --git a/test/fuzz/transformation_function_call_test.cpp b/test/fuzz/transformation_function_call_test.cpp
index 4dca116..b27b3ca 100644
--- a/test/fuzz/transformation_function_call_test.cpp
+++ b/test/fuzz/transformation_function_call_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_function_call.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -132,9 +134,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(59);
@@ -258,7 +260,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Livesafe called from original live block: fine
@@ -268,7 +271,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Livesafe called from livesafe function: fine
@@ -278,7 +282,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Dead called from dead block in injected function: fine
@@ -288,7 +293,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Non-livesafe called from dead block in livesafe function: OK
@@ -298,7 +304,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Livesafe called from dead block with non-arbitrary parameter
@@ -308,7 +315,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -449,9 +457,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(11);
diff --git a/test/fuzz/transformation_inline_function_test.cpp b/test/fuzz/transformation_inline_function_test.cpp
index 09cf936..092043d 100644
--- a/test/fuzz/transformation_inline_function_test.cpp
+++ b/test/fuzz/transformation_inline_function_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_inline_function.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -140,9 +142,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests undefined OpFunctionCall instruction.
@@ -270,9 +272,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationInlineFunction(43, {{22, 45},
@@ -378,7 +380,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -508,9 +511,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationInlineFunction(30, {});
@@ -746,7 +749,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -780,9 +784,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationInlineFunction transformation(6,
@@ -790,7 +794,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -897,9 +902,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   auto overflow_ids_unique_ptr = MakeUnique<CounterOverflowIdSource>(1000);
   auto overflow_ids_ptr = overflow_ids_unique_ptr.get();
   TransformationContext transformation_context(
@@ -1011,7 +1016,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
diff --git a/test/fuzz/transformation_invert_comparison_operator_test.cpp b/test/fuzz/transformation_invert_comparison_operator_test.cpp
index 5f10068..3970f83 100644
--- a/test/fuzz/transformation_invert_comparison_operator_test.cpp
+++ b/test/fuzz/transformation_invert_comparison_operator_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_invert_comparison_operator.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -57,9 +59,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Operator id is not valid.
diff --git a/test/fuzz/transformation_load_test.cpp b/test/fuzz/transformation_load_test.cpp
index 6df7054..a03ffdd 100644
--- a/test/fuzz/transformation_load_test.cpp
+++ b/test/fuzz/transformation_load_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_load.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -83,9 +85,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
@@ -190,7 +192,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -200,7 +203,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -210,7 +214,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -220,7 +225,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_make_vector_operation_dynamic_test.cpp b/test/fuzz/transformation_make_vector_operation_dynamic_test.cpp
index 6fe2e21..064759a 100644
--- a/test/fuzz/transformation_make_vector_operation_dynamic_test.cpp
+++ b/test/fuzz/transformation_make_vector_operation_dynamic_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_make_vector_operation_dynamic.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -91,9 +93,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests undefined instruction.
@@ -202,9 +204,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationMakeVectorOperationDynamic(22, 9);
@@ -352,7 +354,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
diff --git a/test/fuzz/transformation_merge_blocks_test.cpp b/test/fuzz/transformation_merge_blocks_test.cpp
index 4512899..d5289d3 100644
--- a/test/fuzz/transformation_merge_blocks_test.cpp
+++ b/test/fuzz/transformation_merge_blocks_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_merge_blocks.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -42,9 +44,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationMergeBlocks(3).IsApplicable(
@@ -82,9 +84,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationMergeBlocks(6).IsApplicable(
@@ -121,9 +123,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationMergeBlocks(10).IsApplicable(
@@ -161,16 +163,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationMergeBlocks transformation(10);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -233,16 +236,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationMergeBlocks transformation(10);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -310,16 +314,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationMergeBlocks transformation(11);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -383,16 +388,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationMergeBlocks transformation(6);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -462,9 +468,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   for (auto& transformation :
@@ -474,7 +480,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -553,9 +560,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   for (auto& transformation :
@@ -564,7 +571,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -643,16 +651,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationMergeBlocks transformation(101);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_merge_function_returns_test.cpp b/test/fuzz/transformation_merge_function_returns_test.cpp
index 330bc97..9eb535f 100644
--- a/test/fuzz/transformation_merge_function_returns_test.cpp
+++ b/test/fuzz/transformation_merge_function_returns_test.cpp
@@ -14,6 +14,7 @@
 
 #include "source/fuzz/transformation_merge_function_returns.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -139,9 +140,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -228,9 +229,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -280,9 +281,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -376,9 +377,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -551,9 +552,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -564,7 +565,8 @@
       transformation1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %12 is available at the end of the entry block of %19 (it is a global
   // variable).
@@ -579,7 +581,8 @@
       transformation2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %27 is available at the end of the entry block of %26 (it is a function
   // parameter).
@@ -594,7 +597,8 @@
       transformation3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %35 is available at the end of the entry block of %33 (it is in the entry
   // block).
@@ -609,7 +613,8 @@
       transformation4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -793,9 +798,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -808,7 +813,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -976,9 +982,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1004,7 +1010,8 @@
   ApplyAndCheckFreshIds(transformation1, context.get(),
                         &transformation_context_with_overflow_ids,
                         overflow_ids_ptr->GetIssuedOverflowIds());
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // No mapping from merge block %27 to fresh ids is given, so overflow ids are
   // needed.
@@ -1021,7 +1028,8 @@
       context.get(), transformation_context_with_overflow_ids));
   ApplyAndCheckFreshIds(transformation2, context.get(),
                         &transformation_context_with_overflow_ids, {1002});
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
@@ -1160,9 +1168,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1176,7 +1184,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1304,9 +1313,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1326,7 +1335,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1461,9 +1471,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1535,9 +1545,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1550,7 +1560,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1679,9 +1690,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1693,7 +1704,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // In function %20, the definition of id %28 will not dominate its use in
   // instruction %32 after the transformation is applied, because %28 dominates
@@ -1810,9 +1822,10 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
+
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1821,7 +1834,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_move_block_down_test.cpp b/test/fuzz/transformation_move_block_down_test.cpp
index 48b4083..e8d2588 100644
--- a/test/fuzz/transformation_move_block_down_test.cpp
+++ b/test/fuzz/transformation_move_block_down_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_move_block_down.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -333,7 +335,8 @@
   // Let's bubble 20 all the way down.
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 20 21 25 29 32 30 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -351,7 +354,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 21 20 25 29 32 30 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -369,7 +373,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 21 25 20 29 32 30 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -386,7 +391,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 21 25 29 20 32 30 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -404,7 +410,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 21 25 29 32 20 30 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -422,7 +429,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 23 21 25 29 32 30 20 15
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -440,7 +448,8 @@
       move_down_15.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_20, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_bubbling_20_down = R"(
                OpCapability Shader
@@ -530,7 +539,8 @@
       move_down_20.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_23, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 21 23 25 29 32 30 15 20
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -548,7 +558,8 @@
       move_down_20.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_23, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 21 25 23 29 32 30 15 20
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -565,7 +576,8 @@
       move_down_20.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_21, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Current ordering: 5 14 25 21 23 29 32 30 15 20
   ASSERT_FALSE(move_down_5.IsApplicable(context.get(), transformation_context));
@@ -581,7 +593,8 @@
       move_down_20.IsApplicable(context.get(), transformation_context));
 
   ApplyAndCheckFreshIds(move_down_14, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_more_shuffling = R"(
                OpCapability Shader
@@ -698,9 +711,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationMoveBlockDown(6);
diff --git a/test/fuzz/transformation_move_instruction_down_test.cpp b/test/fuzz/transformation_move_instruction_down_test.cpp
index e2eca18..45dde7d 100644
--- a/test/fuzz/transformation_move_instruction_down_test.cpp
+++ b/test/fuzz/transformation_move_instruction_down_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_move_instruction_down.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -64,9 +66,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Instruction descriptor is invalid.
@@ -113,7 +115,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationMoveInstructionDown transformation(
@@ -122,7 +125,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -207,9 +211,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Swap memory instruction with an unsupported one.
@@ -228,7 +232,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -310,9 +315,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Swap two barrier instructions.
@@ -336,7 +341,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationMoveInstructionDown transformation(
@@ -345,7 +351,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   ASSERT_TRUE(IsEqual(env, shader, context.get()));
@@ -391,9 +398,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Swap simple and barrier instructions.
@@ -404,7 +411,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationMoveInstructionDown transformation(
@@ -413,7 +421,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   // Swap simple and memory instructions.
@@ -424,7 +433,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationMoveInstructionDown transformation(
@@ -433,7 +443,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   // Swap two simple instructions.
@@ -444,7 +455,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -601,9 +613,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
@@ -696,7 +708,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   ASSERT_TRUE(IsEqual(env, shader, context.get()));
diff --git a/test/fuzz/transformation_mutate_pointer_test.cpp b/test/fuzz/transformation_mutate_pointer_test.cpp
index a983015..76bd282 100644
--- a/test/fuzz/transformation_mutate_pointer_test.cpp
+++ b/test/fuzz/transformation_mutate_pointer_test.cpp
@@ -14,6 +14,7 @@
 
 #include "source/fuzz/transformation_mutate_pointer.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -77,9 +78,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(35);
@@ -156,7 +157,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -266,9 +268,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(7);
@@ -287,7 +289,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_outline_function_test.cpp b/test/fuzz/transformation_outline_function_test.cpp
index fcbcf2c..c567680 100644
--- a/test/fuzz/transformation_outline_function_test.cpp
+++ b/test/fuzz/transformation_outline_function_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_outline_function.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -43,9 +45,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(5, 5, /* not relevant */ 200,
@@ -54,7 +56,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -106,9 +109,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(5, 5, /* not relevant */ 200,
@@ -161,9 +164,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 13, /* not relevant */
@@ -172,7 +175,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -248,9 +252,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 6, /* not relevant */ 200,
@@ -259,7 +263,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -324,9 +329,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 6, 99, 100, 101, 102, 103,
@@ -334,7 +339,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -421,9 +427,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -432,7 +438,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -519,9 +526,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 6, 100, 101, 102, 103, 104,
@@ -529,7 +536,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -595,9 +603,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 6, 100, 101, 102, 103, 104,
@@ -605,7 +613,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -681,9 +690,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(11, 11, 100, 101, 102, 103, 104,
@@ -691,7 +700,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -769,9 +779,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 8, 100, 101, 102, 103, 104,
@@ -817,9 +827,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 11, /* not relevant */ 200,
@@ -866,9 +876,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 11, /* not relevant */ 200,
@@ -916,9 +926,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 11, /* not relevant */ 200,
@@ -958,9 +968,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 8, 100, 101, 102, 103, 104,
@@ -1000,9 +1010,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(7, 8, 100, 101, 102, 103, 104,
@@ -1041,9 +1051,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 7, 100, 101, 102, 103, 104,
@@ -1084,9 +1094,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(6, 7, 100, 101, 102, 103, 104,
@@ -1127,9 +1137,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(8, 11, 100, 101, 102, 103, 104,
@@ -1167,9 +1177,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1187,7 +1197,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1256,9 +1267,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1276,7 +1287,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1349,9 +1361,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1369,7 +1381,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1437,9 +1450,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1457,7 +1470,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1521,9 +1535,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1576,9 +1590,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1631,9 +1645,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1689,9 +1703,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1749,9 +1763,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1814,9 +1828,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -1834,7 +1848,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -1968,9 +1983,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactFunctionIsLivesafe(30);
@@ -1994,7 +2009,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // The original function should still be livesafe.
   ASSERT_TRUE(transformation_context.GetFactManager()->FunctionIsLivesafe(30));
@@ -2195,9 +2211,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   for (uint32_t block_id : {16u, 23u, 24u, 26u, 27u, 34u, 35u, 50u}) {
@@ -2219,7 +2235,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // All the original blocks, plus the new function entry block, should be dead.
   for (uint32_t block_id : {16u, 23u, 24u, 26u, 27u, 34u, 35u, 50u, 203u}) {
     ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(block_id));
@@ -2277,9 +2294,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   for (uint32_t block_id : {32u, 34u, 35u}) {
@@ -2301,7 +2318,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // The blocks that were originally dead, but not others, should be dead.
   for (uint32_t block_id : {32u, 34u, 35u}) {
     ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(block_id));
@@ -2360,9 +2378,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(9);
@@ -2384,7 +2402,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // The variables that were originally irrelevant, plus input parameters
   // corresponding to them, should be irrelevant.  The rest should not be.
   for (uint32_t variable_id : {9u, 14u, 206u, 208u}) {
@@ -2434,9 +2453,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -2490,9 +2509,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -2671,7 +2690,8 @@
   {
     const auto context =
         BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
@@ -2695,7 +2715,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     std::string variant_shader = R"(
                  OpCapability Shader
@@ -2814,7 +2835,8 @@
   {
     const auto context =
         BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     auto overflow_ids_unique_ptr = MakeUnique<CounterOverflowIdSource>(2000);
     auto overflow_ids_ptr = overflow_ids_unique_ptr.get();
     TransformationContext new_transformation_context(
@@ -2829,7 +2851,8 @@
     ApplyAndCheckFreshIds(transformation_with_missing_input_and_output_ids,
                           context.get(), &new_transformation_context,
                           overflow_ids_ptr->GetIssuedOverflowIds());
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     std::string variant_shader = R"(
                  OpCapability Shader
@@ -2977,9 +3000,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -3034,9 +3057,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -3054,7 +3077,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -3125,9 +3149,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationOutlineFunction transformation(
@@ -3145,7 +3169,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_permute_function_parameters_test.cpp b/test/fuzz/transformation_permute_function_parameters_test.cpp
index dec6c76..c1eb125 100644
--- a/test/fuzz/transformation_permute_function_parameters_test.cpp
+++ b/test/fuzz/transformation_permute_function_parameters_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_permute_function_parameters.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -251,9 +253,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Can't permute main function
@@ -294,7 +296,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationPermuteFunctionParameters transformation(28, 106, {1, 0});
@@ -302,7 +305,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationPermuteFunctionParameters transformation(200, 107, {1, 0});
@@ -310,7 +314,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationPermuteFunctionParameters transformation(219, 108, {1, 0});
@@ -318,7 +323,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationPermuteFunctionParameters transformation(229, 109, {1, 0});
@@ -326,7 +332,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_permute_phi_operands_test.cpp b/test/fuzz/transformation_permute_phi_operands_test.cpp
index 30e69e2..2843cfc 100644
--- a/test/fuzz/transformation_permute_phi_operands_test.cpp
+++ b/test/fuzz/transformation_permute_phi_operands_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_permute_phi_operands.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -66,9 +68,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Result id is invalid.
diff --git a/test/fuzz/transformation_propagate_instruction_down_test.cpp b/test/fuzz/transformation_propagate_instruction_down_test.cpp
index ecb4a67..52974ca 100644
--- a/test/fuzz/transformation_propagate_instruction_down_test.cpp
+++ b/test/fuzz/transformation_propagate_instruction_down_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_propagate_instruction_down.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/counter_overflow_id_source.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -105,9 +107,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -177,7 +179,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
         MakeDataDescriptor(201, {}), MakeDataDescriptor(202, {})));
@@ -335,9 +338,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -365,7 +368,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   // No transformation has introduced an OpPhi instruction.
@@ -471,9 +475,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -485,7 +489,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     ASSERT_FALSE(context->get_def_use_mgr()->GetDef(200));
   }
   {
@@ -505,7 +510,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -582,9 +588,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options,
       MakeUnique<CounterOverflowIdSource>(300));
@@ -594,7 +600,8 @@
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context,
                         {300});
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -671,9 +678,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -690,7 +697,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(201));
     ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(202));
@@ -716,7 +724,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(203));
     ASSERT_TRUE(transformation_context.GetFactManager()->IdIsIrrelevant(204));
@@ -742,7 +751,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
 
     ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(206));
     ASSERT_FALSE(transformation_context.GetFactManager()->IdIsIrrelevant(207));
@@ -857,9 +867,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -870,7 +880,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   // Can't replace usage of %22 in %26.
@@ -966,9 +977,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -980,7 +991,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Can propagate %201 from %20 into %21.
@@ -990,7 +1002,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   // Can't propagate %24 from %21 into %20.
@@ -1068,9 +1081,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -1083,7 +1096,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_propagate_instruction_up_test.cpp b/test/fuzz/transformation_propagate_instruction_up_test.cpp
index 2823712..07c249d 100644
--- a/test/fuzz/transformation_propagate_instruction_up_test.cpp
+++ b/test/fuzz/transformation_propagate_instruction_up_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_propagate_instruction_up.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -71,9 +73,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // |block_id| is invalid.
@@ -114,7 +116,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     TransformationPropagateInstructionUp transformation(19, {{{5, 41}}});
@@ -122,7 +125,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -183,7 +187,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   after_transformation = R"(
@@ -246,7 +251,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   after_transformation = R"(
@@ -357,9 +363,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationPropagateInstructionUp transformation(
@@ -367,7 +373,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -474,9 +481,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationPropagateInstructionUp transformation(
@@ -484,7 +491,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -587,9 +595,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationPropagateInstructionUp transformation(
@@ -597,7 +605,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -680,9 +689,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Required capabilities haven't yet been specified.
@@ -695,7 +704,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -759,9 +769,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Required capabilities haven't yet been specified
@@ -774,7 +784,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -838,16 +849,17 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationPropagateInstructionUp transformation(9, {{{5, 40}}});
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_push_id_through_variable_test.cpp b/test/fuzz/transformation_push_id_through_variable_test.cpp
index 3fbe132..cd45c4c 100644
--- a/test/fuzz/transformation_push_id_through_variable_test.cpp
+++ b/test/fuzz/transformation_push_id_through_variable_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_push_id_through_variable.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -100,7 +102,8 @@
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests the reference shader validity.
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Tests |value_synonym_id| and |variable_id| are fresh ids.
   uint32_t value_id = 21;
@@ -573,7 +576,8 @@
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests the reference shader validity.
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   uint32_t value_id = 21;
   uint32_t value_synonym_id = 62;
@@ -588,7 +592,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(21, {}), MakeDataDescriptor(62, {})));
 }
@@ -672,7 +677,8 @@
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests the reference shader validity.
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(21);
 
@@ -689,7 +695,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(21, {}), MakeDataDescriptor(62, {})));
 }
@@ -735,7 +742,8 @@
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests the reference shader validity.
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   transformation_context.GetFactManager()->AddFactBlockIsDead(15);
   auto transformation = TransformationPushIdThroughVariable(
@@ -744,7 +752,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(14, {}), MakeDataDescriptor(100, {})));
 }
diff --git a/test/fuzz/transformation_record_synonymous_constants_test.cpp b/test/fuzz/transformation_record_synonymous_constants_test.cpp
index ffc5f9a..010cb12 100644
--- a/test/fuzz/transformation_record_synonymous_constants_test.cpp
+++ b/test/fuzz/transformation_record_synonymous_constants_test.cpp
@@ -15,6 +15,8 @@
 
 #include "source/fuzz/transformation_record_synonymous_constants.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -88,7 +90,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %3 is not a constant declaration
   ASSERT_FALSE(TransformationRecordSynonymousConstants(3, 9).IsApplicable(
@@ -196,7 +199,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %9 and %11 are not equivalent
   ASSERT_FALSE(TransformationRecordSynonymousConstants(9, 11).IsApplicable(
@@ -287,7 +291,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %9 and %13 are not equivalent
   ASSERT_FALSE(TransformationRecordSynonymousConstants(9, 13).IsApplicable(
@@ -392,7 +397,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %25 and %27 are equivalent (25 is zero-like, 27 is null)
   ASSERT_TRUE(TransformationRecordSynonymousConstants(25, 27).IsApplicable(
@@ -528,7 +534,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %29 and %35 are not equivalent (they have different types)
   ASSERT_FALSE(TransformationRecordSynonymousConstants(29, 35).IsApplicable(
@@ -625,7 +632,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %25 and %31 are not equivalent (they have different types)
   ASSERT_FALSE(TransformationRecordSynonymousConstants(25, 31).IsApplicable(
@@ -715,7 +723,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %15 and %17 are not equivalent (having non-equivalent components)
   ASSERT_FALSE(TransformationRecordSynonymousConstants(15, 17).IsApplicable(
@@ -789,9 +798,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_TRUE(TransformationRecordSynonymousConstants(7, 8).IsApplicable(
@@ -824,9 +833,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_TRUE(TransformationRecordSynonymousConstants(7, 8).IsApplicable(
@@ -858,9 +867,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationRecordSynonymousConstants(7, 8).IsApplicable(
diff --git a/test/fuzz/transformation_replace_add_sub_mul_with_carrying_extended_test.cpp b/test/fuzz/transformation_replace_add_sub_mul_with_carrying_extended_test.cpp
index a033fca..5bc2a8e 100644
--- a/test/fuzz/transformation_replace_add_sub_mul_with_carrying_extended_test.cpp
+++ b/test/fuzz/transformation_replace_add_sub_mul_with_carrying_extended_test.cpp
@@ -14,6 +14,7 @@
 
 #include "source/fuzz/transformation_replace_add_sub_mul_with_carrying_extended.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -410,7 +411,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_2 =
       TransformationReplaceAddSubMulWithCarryingExtended(81, 18);
@@ -418,7 +420,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_3 =
       TransformationReplaceAddSubMulWithCarryingExtended(82, 21);
@@ -426,7 +429,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_3, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_4 =
       TransformationReplaceAddSubMulWithCarryingExtended(83, 31);
@@ -434,7 +438,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_4, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_5 =
       TransformationReplaceAddSubMulWithCarryingExtended(84, 42);
@@ -442,7 +447,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_5, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_6 =
       TransformationReplaceAddSubMulWithCarryingExtended(85, 45);
@@ -450,7 +456,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_6, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_7 =
       TransformationReplaceAddSubMulWithCarryingExtended(86, 48);
@@ -458,7 +465,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_7, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_8 =
       TransformationReplaceAddSubMulWithCarryingExtended(87, 59);
@@ -466,7 +474,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_8, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_boolean_constant_with_constant_binary_test.cpp b/test/fuzz/transformation_replace_boolean_constant_with_constant_binary_test.cpp
index ed61bee..b8c2a8a 100644
--- a/test/fuzz/transformation_replace_boolean_constant_with_constant_binary_test.cpp
+++ b/test/fuzz/transformation_replace_boolean_constant_with_constant_binary_test.cpp
@@ -14,6 +14,7 @@
 
 #include "source/fuzz/transformation_replace_boolean_constant_with_constant_binary.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/id_use_descriptor.h"
 #include "source/fuzz/instruction_descriptor.h"
@@ -160,9 +161,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   std::vector<protobufs::IdUseDescriptor> uses_of_true = {
@@ -292,22 +293,26 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(replace_true_with_double_comparison, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(replace_true_with_uint32_comparison.IsApplicable(
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(replace_true_with_uint32_comparison, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(replace_false_with_float_comparison.IsApplicable(
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(replace_false_with_float_comparison, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(replace_false_with_sint64_comparison.IsApplicable(
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(replace_false_with_sint64_comparison, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after = R"(
                OpCapability Shader
@@ -420,7 +425,8 @@
     context->module()->AddGlobalValue(MakeUnique<opt::Instruction>(
         context.get(), SpvOpConstant, 6, 200, operands));
     fuzzerutil::UpdateModuleIdBound(context.get(), 200);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     // The transformation is not applicable because %200 is NaN.
     ASSERT_FALSE(TransformationReplaceBooleanConstantWithConstantBinary(
                      uses_of_true[0], 11, 200, SpvOpFOrdLessThan, 300)
@@ -436,7 +442,8 @@
     context->module()->AddGlobalValue(MakeUnique<opt::Instruction>(
         context.get(), SpvOpConstant, 6, 201, operands));
     fuzzerutil::UpdateModuleIdBound(context.get(), 201);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     // Even though the double constant %11 is less than the infinity %201, the
     // transformation is restricted to only apply to finite values.
     ASSERT_FALSE(TransformationReplaceBooleanConstantWithConstantBinary(
@@ -460,7 +467,8 @@
     context->module()->AddGlobalValue(MakeUnique<opt::Instruction>(
         context.get(), SpvOpConstant, 12, 203, operands));
     fuzzerutil::UpdateModuleIdBound(context.get(), 203);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     // Even though the negative infinity at %203 is less than the positive
     // infinity %202, the transformation is restricted to only apply to finite
     // values.
@@ -533,9 +541,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto use_of_true_in_if = MakeIdUseDescriptor(
@@ -551,12 +559,14 @@
   ASSERT_TRUE(
       replacement_1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement_1, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(
       replacement_2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement_2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after = R"(
                OpCapability Shader
@@ -647,9 +657,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor = MakeInstructionDescriptor(14, SpvOpPhi, 0);
@@ -692,7 +702,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -724,9 +735,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationReplaceBooleanConstantWithConstantBinary(
diff --git a/test/fuzz/transformation_replace_branch_from_dead_block_with_exit_test.cpp b/test/fuzz/transformation_replace_branch_from_dead_block_with_exit_test.cpp
index ee1252d..ddf5d11 100644
--- a/test/fuzz/transformation_replace_branch_from_dead_block_with_exit_test.cpp
+++ b/test/fuzz/transformation_replace_branch_from_dead_block_with_exit_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_branch_from_dead_block_with_exit.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -64,9 +66,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -117,7 +119,8 @@
   ASSERT_FALSE(
       transformation2.IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -265,9 +268,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -331,7 +334,8 @@
   ASSERT_FALSE(
       transformation1.IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -481,9 +485,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -508,7 +512,8 @@
   ASSERT_FALSE(
       transformation2.IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_constant_with_uniform_test.cpp b/test/fuzz/transformation_replace_constant_with_uniform_test.cpp
index 1e084e7..fe76068 100644
--- a/test/fuzz/transformation_replace_constant_with_uniform_test.cpp
+++ b/test/fuzz/transformation_replace_constant_with_uniform_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_constant_with_uniform.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "source/fuzz/uniform_buffer_element_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -102,9 +104,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_a =
@@ -187,7 +189,8 @@
   // Apply the use of 9 in a store.
   ApplyAndCheckFreshIds(transformation_use_of_9_in_store, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string after_replacing_use_of_9_in_store = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -242,7 +245,8 @@
   // Apply the use of 11 in an add.
   ApplyAndCheckFreshIds(transformation_use_of_11_in_add, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string after_replacing_use_of_11_in_add = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -299,7 +303,8 @@
   // Apply the use of 15 in an add.
   ApplyAndCheckFreshIds(transformation_use_of_14_in_add, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   std::string after_replacing_use_of_14_in_add = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
@@ -465,9 +470,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_1 =
@@ -527,7 +532,8 @@
 
   ApplyAndCheckFreshIds(transformation_use_of_13_in_store, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_use_of_13_in_store.IsApplicable(
       context.get(), transformation_context));
   ASSERT_TRUE(transformation_use_of_15_in_add.IsApplicable(
@@ -539,7 +545,8 @@
 
   ApplyAndCheckFreshIds(transformation_use_of_15_in_add, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_use_of_13_in_store.IsApplicable(
       context.get(), transformation_context));
   ASSERT_FALSE(transformation_use_of_15_in_add.IsApplicable(
@@ -551,7 +558,8 @@
 
   ApplyAndCheckFreshIds(transformation_use_of_17_in_add, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_use_of_13_in_store.IsApplicable(
       context.get(), transformation_context));
   ASSERT_FALSE(transformation_use_of_15_in_add.IsApplicable(
@@ -563,7 +571,8 @@
 
   ApplyAndCheckFreshIds(transformation_use_of_20_in_store, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_FALSE(transformation_use_of_13_in_store.IsApplicable(
       context.get(), transformation_context));
   ASSERT_FALSE(transformation_use_of_15_in_add.IsApplicable(
@@ -706,9 +715,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_0 =
@@ -781,9 +790,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_0 =
@@ -855,9 +864,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_3 =
@@ -943,9 +952,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_9 =
@@ -1158,9 +1167,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   const float float_array_values[5] = {1.0, 1.5, 1.75, 1.875, 1.9375};
@@ -1300,7 +1309,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after = R"(
@@ -1500,9 +1510,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   protobufs::UniformBufferElementDescriptor blockname_a =
@@ -1558,9 +1568,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto int_descriptor = MakeUniformBufferElementDescriptor(0, 0, {0});
@@ -1575,7 +1585,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/transformation_replace_copy_memory_with_load_store_test.cpp b/test/fuzz/transformation_replace_copy_memory_with_load_store_test.cpp
index 6718bea..bcd04af 100644
--- a/test/fuzz/transformation_replace_copy_memory_with_load_store_test.cpp
+++ b/test/fuzz/transformation_replace_copy_memory_with_load_store_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_copy_memory_with_load_store.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -69,7 +71,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto instruction_descriptor_invalid_1 =
       MakeInstructionDescriptor(5, SpvOpStore, 0);
@@ -96,7 +99,8 @@
                                                   transformation_context));
   ApplyAndCheckFreshIds(transformation_valid_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_valid_2 = TransformationReplaceCopyMemoryWithLoadStore(
       21, instruction_descriptor_valid_2);
@@ -104,7 +108,8 @@
                                                   transformation_context));
   ApplyAndCheckFreshIds(transformation_valid_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_copy_object_with_store_load_test.cpp b/test/fuzz/transformation_replace_copy_object_with_store_load_test.cpp
index 52b0ed3..fa8c068 100644
--- a/test/fuzz/transformation_replace_copy_object_with_store_load_test.cpp
+++ b/test/fuzz/transformation_replace_copy_object_with_store_load_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_copy_object_with_store_load.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -81,7 +83,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Invalid: fresh_variable_id=10 is not fresh.
   auto transformation_invalid_1 = TransformationReplaceCopyObjectWithStoreLoad(
@@ -127,7 +130,8 @@
                                                   transformation_context));
   ApplyAndCheckFreshIds(transformation_valid_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_valid_2 = TransformationReplaceCopyObjectWithStoreLoad(
       28, 32, SpvStorageClassPrivate, 15);
@@ -135,7 +139,8 @@
                                                   transformation_context));
   ApplyAndCheckFreshIds(transformation_valid_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -232,7 +237,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   transformation_context.GetFactManager()->AddFactBlockIsDead(15);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(11);
diff --git a/test/fuzz/transformation_replace_id_with_synonym_test.cpp b/test/fuzz/transformation_replace_id_with_synonym_test.cpp
index 85cdd53..5c10fc5 100644
--- a/test/fuzz/transformation_replace_id_with_synonym_test.cpp
+++ b/test/fuzz/transformation_replace_id_with_synonym_test.cpp
@@ -14,7 +14,9 @@
 
 #include "source/fuzz/transformation_replace_id_with_synonym.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/data_descriptor.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/id_use_descriptor.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -218,9 +220,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, kComplexShader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIdSynonyms(transformation_context.GetFactManager());
@@ -291,9 +293,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, kComplexShader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIdSynonyms(transformation_context.GetFactManager());
@@ -305,7 +307,8 @@
                                                    transformation_context));
   ApplyAndCheckFreshIds(global_constant_synonym, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto replace_vector_access_chain_index = TransformationReplaceIdWithSynonym(
       MakeIdUseDescriptor(
@@ -315,7 +318,8 @@
       context.get(), transformation_context));
   ApplyAndCheckFreshIds(replace_vector_access_chain_index, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // This is an interesting case because it replaces something that is being
   // copied with something that is already a synonym.
@@ -327,7 +331,8 @@
       regular_replacement.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(regular_replacement, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto regular_replacement2 = TransformationReplaceIdWithSynonym(
       MakeIdUseDescriptor(55, MakeInstructionDescriptor(203, SpvOpStore, 0), 0),
@@ -336,14 +341,16 @@
       regular_replacement2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(regular_replacement2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto good_op_phi = TransformationReplaceIdWithSynonym(
       MakeIdUseDescriptor(74, MakeInstructionDescriptor(86, SpvOpPhi, 0), 2),
       205);
   ASSERT_TRUE(good_op_phi.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(good_op_phi, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -515,9 +522,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->MaybeAddFact(
@@ -532,7 +539,8 @@
       100);
   ASSERT_TRUE(replacement1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement1, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %8 with %101 in:
   // OpStore %8 %11
@@ -541,7 +549,8 @@
       101);
   ASSERT_TRUE(replacement2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %8 with %101 in:
   // %12 = OpLoad %6 %8
@@ -550,7 +559,8 @@
       101);
   ASSERT_TRUE(replacement3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replace %10 with %100 in:
   // OpStore %10 %12
@@ -559,7 +569,8 @@
       100);
   ASSERT_TRUE(replacement4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -647,9 +658,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->MaybeAddFact(
@@ -811,9 +822,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add synonym facts corresponding to the OpCopyObject operations that have
@@ -886,7 +897,8 @@
       100);
   ASSERT_TRUE(replacement4.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement4, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %52 = OpAccessChain %23 %50 %16 *%16*
   // Corresponds to i[0].*f*
@@ -917,7 +929,8 @@
       100);
   ASSERT_TRUE(replacement7.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement7, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replacements of the form %21 -> %101
 
@@ -951,7 +964,8 @@
   ASSERT_TRUE(
       replacement10.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement10, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %44 = OpAccessChain %23 %37 *%21* %21 %43
   // Corresponds to h.*g*.b[0]
@@ -993,7 +1007,8 @@
   ASSERT_TRUE(
       replacement14.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement14, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %53 = OpAccessChain %19 %50 %21 *%21* %16 %16
   // Corresponds to i[1].*g*.a[0]
@@ -1047,7 +1062,8 @@
   ASSERT_TRUE(
       replacement19.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement19, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %27 = OpAccessChain %26 %15 %17
   // Corresponds to d.c
@@ -1079,7 +1095,8 @@
   ASSERT_TRUE(
       replacement22.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement22, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // %58 = OpInBoundsAccessChain %26 %50 %57 %21 %17
   // Corresponds to i[3].g.*c*
@@ -1103,7 +1120,8 @@
   ASSERT_TRUE(
       replacement24.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement24, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replacements of the form %32 -> %106
 
@@ -1117,7 +1135,8 @@
   ASSERT_TRUE(
       replacement25.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement25, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replacements of the form %43 -> %107
 
@@ -1131,7 +1150,8 @@
   ASSERT_TRUE(
       replacement26.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement26, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replacements of the form %55 -> %108
 
@@ -1145,7 +1165,8 @@
   ASSERT_TRUE(
       replacement27.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement27, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Replacements of the form %8 -> %109
 
@@ -1159,7 +1180,8 @@
   ASSERT_TRUE(
       replacement28.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement28, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -1310,9 +1332,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add synonym fact relating %50 and %12.
@@ -1346,7 +1368,8 @@
   ASSERT_TRUE(replacement2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement2, context.get(), &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -1421,9 +1444,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add synonym fact relating %100 and %9.
@@ -1481,9 +1504,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add synonym fact relating %10 and %13 (equivalent integer constant with
@@ -1544,7 +1567,8 @@
                    13)
                    .IsApplicable(context.get(), transformation_context));
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -1624,9 +1648,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Add synonym fact relating %10 and %13 (equivalent integer vectors with
@@ -1662,7 +1686,8 @@
   ASSERT_TRUE(replacement2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(replacement2, context.get(), &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   const std::string after_transformation = R"(
                OpCapability Shader
@@ -1728,9 +1753,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto* op_i_add = context->get_def_use_mgr()->GetDef(18);
diff --git a/test/fuzz/transformation_replace_irrelevant_id_test.cpp b/test/fuzz/transformation_replace_irrelevant_id_test.cpp
index d38e726..345ef86 100644
--- a/test/fuzz/transformation_replace_irrelevant_id_test.cpp
+++ b/test/fuzz/transformation_replace_irrelevant_id_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_irrelevant_id.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/id_use_descriptor.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -72,9 +74,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIrrelevantIdFacts(transformation_context.GetFactManager());
@@ -123,9 +125,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   SetUpIrrelevantIdFacts(transformation_context.GetFactManager());
@@ -139,7 +141,8 @@
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
@@ -217,9 +220,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(13);
diff --git a/test/fuzz/transformation_replace_linear_algebra_instruction_test.cpp b/test/fuzz/transformation_replace_linear_algebra_instruction_test.cpp
index 9879e12..8ec5552 100644
--- a/test/fuzz/transformation_replace_linear_algebra_instruction_test.cpp
+++ b/test/fuzz/transformation_replace_linear_algebra_instruction_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_linear_algebra_instruction.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -68,9 +70,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests linear algebra instructions.
@@ -241,9 +243,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -457,7 +459,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -497,9 +500,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -568,7 +571,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -667,9 +671,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -840,7 +844,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -953,9 +958,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -1173,7 +1178,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -1286,9 +1292,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -1504,7 +1510,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -1671,9 +1678,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -2045,7 +2052,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -2143,9 +2151,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor =
@@ -2333,7 +2341,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
@@ -2379,9 +2388,9 @@
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instruction_descriptor = MakeInstructionDescriptor(24, SpvOpDot, 0);
@@ -2467,7 +2476,8 @@
                OpFunctionEnd
   )";
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }
 
diff --git a/test/fuzz/transformation_replace_load_store_with_copy_memory_test.cpp b/test/fuzz/transformation_replace_load_store_with_copy_memory_test.cpp
index afd15d1..bc10099 100644
--- a/test/fuzz/transformation_replace_load_store_with_copy_memory_test.cpp
+++ b/test/fuzz/transformation_replace_load_store_with_copy_memory_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_load_store_with_copy_memory.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -112,7 +114,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto bad_instruction_descriptor_1 =
       MakeInstructionDescriptor(11, SpvOpConstant, 0);
@@ -184,7 +187,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_1, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   auto transformation_good_2 = TransformationReplaceLoadStoreWithCopyMemory(
       load_instruction_descriptor_3, store_instruction_descriptor_3);
@@ -192,7 +196,8 @@
                                                  transformation_context));
   ApplyAndCheckFreshIds(transformation_good_2, context.get(),
                         &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_opphi_id_from_dead_predecessor_test.cpp b/test/fuzz/transformation_replace_opphi_id_from_dead_predecessor_test.cpp
index e4de4c7..875d79e 100644
--- a/test/fuzz/transformation_replace_opphi_id_from_dead_predecessor_test.cpp
+++ b/test/fuzz/transformation_replace_opphi_id_from_dead_predecessor_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_opphi_id_from_dead_predecessor.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -78,7 +80,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Record the fact that blocks 20, 17, 28 are dead.
   transformation_context.GetFactManager()->AddFactBlockIsDead(20);
@@ -119,7 +122,8 @@
   spvtools::ValidatorOptions validator_options;
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   // Record the fact that blocks 20, 17, 28 are dead.
   transformation_context.GetFactManager()->AddFactBlockIsDead(20);
@@ -147,7 +151,8 @@
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformations = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_opselect_with_conditional_branch_test.cpp b/test/fuzz/transformation_replace_opselect_with_conditional_branch_test.cpp
index 5c52a88..1712855 100644
--- a/test/fuzz/transformation_replace_opselect_with_conditional_branch_test.cpp
+++ b/test/fuzz/transformation_replace_opselect_with_conditional_branch_test.cpp
@@ -14,8 +14,8 @@
 
 #include "source/fuzz/transformation_replace_opselect_with_conditional_branch.h"
 
-#include "source/fuzz/fuzzer_pass_replace_opselects_with_conditional_branches.h"
-#include "source/fuzz/pseudo_random_generator.h"
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -84,9 +84,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // %20 is not an OpSelect instruction.
@@ -186,9 +186,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation =
@@ -211,7 +211,8 @@
   ApplyAndCheckFreshIds(transformation3, context.get(),
                         &transformation_context);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_replace_parameter_with_global_test.cpp b/test/fuzz/transformation_replace_parameter_with_global_test.cpp
index 80b7a0e..478d809 100644
--- a/test/fuzz/transformation_replace_parameter_with_global_test.cpp
+++ b/test/fuzz/transformation_replace_parameter_with_global_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_parameter_with_global.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -114,9 +116,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Parameter id is invalid.
@@ -201,7 +203,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -329,9 +332,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(10);
diff --git a/test/fuzz/transformation_replace_params_with_struct_test.cpp b/test/fuzz/transformation_replace_params_with_struct_test.cpp
index af02682..58fff65 100644
--- a/test/fuzz/transformation_replace_params_with_struct_test.cpp
+++ b/test/fuzz/transformation_replace_params_with_struct_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_replace_params_with_struct.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -122,9 +124,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // |parameter_id| is empty.
@@ -233,7 +235,8 @@
                           &transformation_context);
   }
 
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string expected_shader = R"(
                OpCapability Shader
@@ -375,9 +378,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   {
@@ -388,7 +391,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -436,7 +440,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   after_transformation = R"(
diff --git a/test/fuzz/transformation_set_function_control_test.cpp b/test/fuzz/transformation_set_function_control_test.cpp
index a9bb176..85402e1 100644
--- a/test/fuzz/transformation_set_function_control_test.cpp
+++ b/test/fuzz/transformation_set_function_control_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_set_function_control.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
diff --git a/test/fuzz/transformation_set_loop_control_test.cpp b/test/fuzz/transformation_set_loop_control_test.cpp
index 7d29040..3312a67 100644
--- a/test/fuzz/transformation_set_loop_control_test.cpp
+++ b/test/fuzz/transformation_set_loop_control_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_set_loop_control.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
@@ -254,9 +256,9 @@
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
 
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // These are the loop headers together with the selection controls of their
@@ -949,9 +951,9 @@
     const auto consumer = nullptr;
     const auto context =
         BuildModule(env, consumer, shader, kFuzzAssembleOption);
-    ASSERT_TRUE(IsValid(env, context.get()));
-
     spvtools::ValidatorOptions validator_options;
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
     TransformationContext transformation_context(
         MakeUnique<FactManager>(context.get()), validator_options);
     TransformationSetLoopControl transformation(
diff --git a/test/fuzz/transformation_set_memory_operands_mask_test.cpp b/test/fuzz/transformation_set_memory_operands_mask_test.cpp
index 7a09087..4763d7a 100644
--- a/test/fuzz/transformation_set_memory_operands_mask_test.cpp
+++ b/test/fuzz/transformation_set_memory_operands_mask_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_set_memory_operands_mask.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -91,9 +93,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Not OK: the instruction is not a memory access.
@@ -340,9 +342,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   {
diff --git a/test/fuzz/transformation_set_selection_control_test.cpp b/test/fuzz/transformation_set_selection_control_test.cpp
index bd494a6..c584ff1 100644
--- a/test/fuzz/transformation_set_selection_control_test.cpp
+++ b/test/fuzz/transformation_set_selection_control_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_set_selection_control.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"
 
 namespace spvtools {
diff --git a/test/fuzz/transformation_split_block_test.cpp b/test/fuzz/transformation_split_block_test.cpp
index fc5415c..55091de 100644
--- a/test/fuzz/transformation_split_block_test.cpp
+++ b/test/fuzz/transformation_split_block_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_split_block.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -207,7 +209,8 @@
       MakeInstructionDescriptor(5, SpvOpStore, 0), 100);
   ASSERT_TRUE(split_1.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split_1, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split_1 = R"(
                OpCapability Shader
@@ -255,7 +258,8 @@
       MakeInstructionDescriptor(11, SpvOpStore, 0), 101);
   ASSERT_TRUE(split_2.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split_2, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split_2 = R"(
                OpCapability Shader
@@ -305,7 +309,8 @@
       MakeInstructionDescriptor(14, SpvOpLoad, 0), 102);
   ASSERT_TRUE(split_3.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split_3, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split_3 = R"(
                OpCapability Shader
@@ -431,7 +436,8 @@
       MakeInstructionDescriptor(14, SpvOpSelectionMerge, 0), 100);
   ASSERT_TRUE(split.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split = R"(
                OpCapability Shader
@@ -559,7 +565,8 @@
       MakeInstructionDescriptor(9, SpvOpSelectionMerge, 0), 100);
   ASSERT_TRUE(split.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split = R"(
                OpCapability Shader
@@ -743,7 +750,8 @@
       TransformationSplitBlock(MakeInstructionDescriptor(20, SpvOpPhi, 0), 100);
   ASSERT_TRUE(split.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_split = R"(
                OpCapability Shader
@@ -821,7 +829,8 @@
       MakeInstructionDescriptor(8, SpvOpBranch, 0), 100);
   ASSERT_TRUE(split.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(split, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(8));
   ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(100));
diff --git a/test/fuzz/transformation_store_test.cpp b/test/fuzz/transformation_store_test.cpp
index 65a856c..93257d0 100644
--- a/test/fuzz/transformation_store_test.cpp
+++ b/test/fuzz/transformation_store_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_store.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -92,9 +94,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
@@ -234,7 +236,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -245,7 +248,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -256,7 +260,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -267,7 +272,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   {
@@ -278,7 +284,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
@@ -399,9 +406,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactBlockIsDead(5);
diff --git a/test/fuzz/transformation_swap_commutable_operands_test.cpp b/test/fuzz/transformation_swap_commutable_operands_test.cpp
index f2f80ab..0731529 100644
--- a/test/fuzz/transformation_swap_commutable_operands_test.cpp
+++ b/test/fuzz/transformation_swap_commutable_operands_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_swap_commutable_operands.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -110,9 +112,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests existing commutative instructions
@@ -335,9 +337,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instructionDescriptor = MakeInstructionDescriptor(22, SpvOpIAdd, 0);
diff --git a/test/fuzz/transformation_swap_conditional_branch_operands_test.cpp b/test/fuzz/transformation_swap_conditional_branch_operands_test.cpp
index 74c4a07..e7a8732 100644
--- a/test/fuzz/transformation_swap_conditional_branch_operands_test.cpp
+++ b/test/fuzz/transformation_swap_conditional_branch_operands_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_swap_conditional_branch_operands.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -67,9 +69,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Invalid instruction descriptor.
diff --git a/test/fuzz/transformation_toggle_access_chain_instruction_test.cpp b/test/fuzz/transformation_toggle_access_chain_instruction_test.cpp
index 756c69d..84ed20d 100644
--- a/test/fuzz/transformation_toggle_access_chain_instruction_test.cpp
+++ b/test/fuzz/transformation_toggle_access_chain_instruction_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_toggle_access_chain_instruction.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -110,9 +112,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Tests existing access chain instructions
@@ -304,9 +306,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_5;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto instructionDescriptor =
diff --git a/test/fuzz/transformation_vector_shuffle_test.cpp b/test/fuzz/transformation_vector_shuffle_test.cpp
index 8a8279b..e3dc0a7 100644
--- a/test/fuzz/transformation_vector_shuffle_test.cpp
+++ b/test/fuzz/transformation_vector_shuffle_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_vector_shuffle.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -84,9 +86,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactDataSynonym(
@@ -492,9 +494,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Cannot insert before the OpVariables of a function.
@@ -607,9 +609,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationVectorShuffle transformation(
@@ -617,7 +619,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {0}), MakeDataDescriptor(200, {1})));
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
@@ -687,9 +690,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(112);
@@ -698,7 +701,8 @@
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   // Because %12 is not irrelevant, we get a synonym between it and %200[1].
   ASSERT_TRUE(transformation_context.GetFactManager()->IsSynonymous(
       MakeDataDescriptor(12, {0}), MakeDataDescriptor(200, {1})));
@@ -742,9 +746,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   transformation_context.GetFactManager()->AddFactIdIsIrrelevant(40);
diff --git a/test/fuzz/transformation_wrap_early_terminator_in_function_test.cpp b/test/fuzz/transformation_wrap_early_terminator_in_function_test.cpp
index edef6b4..7b4e487 100644
--- a/test/fuzz/transformation_wrap_early_terminator_in_function_test.cpp
+++ b/test/fuzz/transformation_wrap_early_terminator_in_function_test.cpp
@@ -14,6 +14,8 @@
 
 #include "source/fuzz/transformation_wrap_early_terminator_in_function.h"
 
+#include "gtest/gtest.h"
+#include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
 
@@ -88,9 +90,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -210,9 +212,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -235,7 +237,8 @@
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
   }
-  ASSERT_TRUE(IsValid(env, context.get()));
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
 
   std::string after_transformation = R"(
                OpCapability Shader
diff --git a/test/fuzz/transformation_wrap_region_in_selection_test.cpp b/test/fuzz/transformation_wrap_region_in_selection_test.cpp
index 5881b3b..9669c41 100644
--- a/test/fuzz/transformation_wrap_region_in_selection_test.cpp
+++ b/test/fuzz/transformation_wrap_region_in_selection_test.cpp
@@ -14,6 +14,7 @@
 
 #include "source/fuzz/transformation_wrap_region_in_selection.h"
 
+#include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "source/fuzz/instruction_descriptor.h"
 #include "test/fuzz/fuzz_test_util.h"
@@ -94,9 +95,9 @@
   const auto env = SPV_ENV_UNIVERSAL_1_3;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
-  ASSERT_TRUE(IsValid(env, context.get()));
-
   spvtools::ValidatorOptions validator_options;
+  ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
+                                               kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
 
@@ -162,7 +163,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Merge block candidate can be a header block of some existing construct.
@@ -171,7 +173,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
   {
     // Wrap a loop construct.
@@ -180,7 +183,8 @@
         transformation.IsApplicable(context.get(), transformation_context));
     ApplyAndCheckFreshIds(transformation, context.get(),
                           &transformation_context);
-    ASSERT_TRUE(IsValid(env, context.get()));
+    ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(
+        context.get(), validator_options, kConsoleMessageConsumer));
   }
 
   std::string after_transformation = R"(
diff --git a/test/fuzz/uniform_buffer_element_descriptor_test.cpp b/test/fuzz/uniform_buffer_element_descriptor_test.cpp
index 9bc1cff..dd24794 100644
--- a/test/fuzz/uniform_buffer_element_descriptor_test.cpp
+++ b/test/fuzz/uniform_buffer_element_descriptor_test.cpp
@@ -14,7 +14,7 @@
 
 #include "source/fuzz/uniform_buffer_element_descriptor.h"
 
-#include "test/fuzz/fuzz_test_util.h"
+#include "gtest/gtest.h"
 
 namespace spvtools {
 namespace fuzz {
diff --git a/tools/fuzz/fuzz.cpp b/tools/fuzz/fuzz.cpp
index 97d3af9..5ee0fb1 100644
--- a/tools/fuzz/fuzz.cpp
+++ b/tools/fuzz/fuzz.cpp
@@ -618,6 +618,34 @@
   DumpShader(binary, filename);
 }
 
+// Dumps |transformations| to file |filename| in binary format. Useful for
+// interactive debugging.
+void DumpTransformationsBinary(
+    const spvtools::fuzz::protobufs::TransformationSequence& transformations,
+    const char* filename) {
+  std::ofstream transformations_file;
+  transformations_file.open(filename, std::ios::out | std::ios::binary);
+  transformations.SerializeToOstream(&transformations_file);
+  transformations_file.close();
+}
+
+// Dumps |transformations| to file |filename| in JSON format. Useful for
+// interactive debugging.
+void DumpTransformationsJson(
+    const spvtools::fuzz::protobufs::TransformationSequence& transformations,
+    const char* filename) {
+  std::string json_string;
+  auto json_options = google::protobuf::util::JsonOptions();
+  json_options.add_whitespace = true;
+  auto json_generation_status = google::protobuf::util::MessageToJsonString(
+      transformations, &json_string, json_options);
+  if (json_generation_status == google::protobuf::util::Status::OK) {
+    std::ofstream transformations_json_file(filename);
+    transformations_json_file << json_string;
+    transformations_json_file.close();
+  }
+}
+
 const auto kDefaultEnvironment = SPV_ENV_UNIVERSAL_1_3;
 
 int main(int argc, const char** argv) {