ICU-21121 Enable tests for MacOSX build bot.
diff --git a/.ci-builds/.azure-pipelines.yml b/.ci-builds/.azure-pipelines.yml
index d614dba..4e9039c 100644
--- a/.ci-builds/.azure-pipelines.yml
+++ b/.ci-builds/.azure-pipelines.yml
@@ -298,8 +298,8 @@
       lfs: true
       fetchDepth: 1
     - script: |
-        export CPPFLAGS="-Werror -Wall -Wextra -Wextra-semi -Wundef -Wnon-virtual-dtor" && cd icu4c/source && ./runConfigureICU MacOSX && make -j2 tests
-      displayName: 'Build only (WarningsAsErrors)'
+        export CPPFLAGS="-Werror -Wall -Wextra -Wextra-semi -Wundef -Wnon-virtual-dtor" && cd icu4c/source && ./runConfigureICU MacOSX && make -j2 check
+      displayName: 'Build and Test (WarningsAsErrors)'
       env:
         CC: clang
         CXX: clang++