tests/OSPathTest.cpp

/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkOSFile.h"
#include "SkString.h"
#include "Test.h"

/**
 *  Test SkPathJoin and SkBasename.
 *  Will use SkPathJoin to append filename to dir, test that it works correctly,
 *  and tests using SkBasename on the result.
 *  @param reporter Reporter for test conditions.
 *  @param dir String representing the path to a folder. May or may not
 *      end with SkPATH_SEPARATOR.
 *  @param filename String representing the basename of a file. Must NOT
 *      contain SkPATH_SEPARATOR.
 */
static void test_dir_with_file(skiatest::Reporter* reporter, SkString dir,
                               SkString filename) {
    // If filename contains SkPATH_SEPARATOR, the tests will fail.
    SkASSERT(!filename.contains(SkPATH_SEPARATOR));

    // Tests for SkOSPath::SkPathJoin and SkOSPath::SkBasename

    // fullName should be "dir<SkPATH_SEPARATOR>file"
    SkString fullName = SkOSPath::SkPathJoin(dir.c_str(), filename.c_str());

    // fullName should be the combined size of dir and file, plus one if
    // dir did not include the final path separator.
    size_t expectedSize = dir.size() + filename.size();
    if (!dir.endsWith(SkPATH_SEPARATOR)) {
        expectedSize++;
    }
    REPORTER_ASSERT(reporter, fullName.size() == expectedSize);

    SkString basename = SkOSPath::SkBasename(fullName.c_str());

    // basename should be the same as filename
    REPORTER_ASSERT(reporter, basename.equals(filename));

    // basename will not contain a path separator
    REPORTER_ASSERT(reporter, !basename.contains(SkPATH_SEPARATOR));

    // Now take the basename of filename, which should be the same as filename.
    basename = SkOSPath::SkBasename(filename.c_str());
    REPORTER_ASSERT(reporter, basename.equals(filename));
}

DEF_TEST(OSPath, reporter) {
    SkString dir("dir");
    SkString filename("file");
    test_dir_with_file(reporter, dir, filename);

    // Now make sure this works with a path separator at the end of dir.
    dir.appendUnichar(SkPATH_SEPARATOR);
    test_dir_with_file(reporter, dir, filename);

    // Test using no filename.
    test_dir_with_file(reporter, dir, SkString());

    // Testing using no directory.
    test_dir_with_file(reporter, SkString(), filename);

    // Test with a sub directory.
    dir.append("subDir");
    test_dir_with_file(reporter, dir, filename);

    // Basename of a directory with a path separator at the end is empty.
    dir.appendUnichar(SkPATH_SEPARATOR);
    SkString baseOfDir = SkOSPath::SkBasename(dir.c_str());
    REPORTER_ASSERT(reporter, baseOfDir.size() == 0);

    // Basename of NULL is an empty string.
    SkString empty = SkOSPath::SkBasename(NULL);
    REPORTER_ASSERT(reporter, empty.size() == 0);

    // Test that NULL can be used for the directory and filename.
    SkString emptyPath = SkOSPath::SkPathJoin(NULL, NULL);
    REPORTER_ASSERT(reporter, emptyPath.size() == 1);
    REPORTER_ASSERT(reporter, emptyPath.contains(SkPATH_SEPARATOR));
}