public static FileInputStream openInputStream(File file) {
        try {
            return FileUtils.openInputStream(file);
        } catch (IOException e) {
            throw new RuntimeException("Problems opening file input stream for file: " + file, e);
        }
    }

    /**
     * Ensures that the given file (or directory) is marked as modified. If the file
     * (or directory) does not exist, a new file is created.

            }
        """
        file('a.txt').text = 'a1'
        file('a.bin').text = 'a2'
        file('b.txt').text = 'b1'
        file('b.bin').text = 'b2'

        when:
        run("merge")

        then:
        outputContains("result = [a.txt, b.txt, a.bin, b.bin]")
    }

    def "can subtract the elements of another file collection"() {
        given:

        fromString()      | "ProcessGroovyMethods.execute(command, listOf(\"FOOBAR=foobar\"), file(\"$pwd\"))"  | pwd               | "foobar"
        fromStringArray() | "ProcessGroovyMethods.execute(command, listOf(\"FOOBAR=foobar\"), file(\"$pwd\"))"  | pwd               | "foobar"

          + "[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";

  private File testDir;
  private File tempDir;

  private final Set<File> filesToDelete = new HashSet<>();

  @Override
  protected void tearDown() {
    for (File file : filesToDelete) {
      if (file.exists()) {
        delete(file);
      }
    }
    filesToDelete.clear();
  }

  private File getTestDir() throws IOException {
    if (testDir != null) {

                outputFile = project.file("\${buildDir}/output.txt")
            }
        """
        file('foo/Changing.java') << toUnix(TEXT_WITH_LINE_ENDINGS)
        file('foo/Changing.jpg').bytes = BINARY_CONTENT_WITH_LF

        when:
        execute("taskWithInputs")

        then:
        executedAndNotSkipped(":taskWithInputs")

        when:

        target.file( '.git').assertIsDir()
        target.file( 'submodule/foo.txt').text == "hello from submodule"
    }

    def 'reset a cloned repository with dirty working dir'() {
        given:
        def target = tmpDir.file('versionDir')
        gitVcs.populate(target, repoHead, repoSpec)

        def removed = target.file("source.txt")
        removed.delete()
        def changed = target.file("dir/another.txt")

    }

    def "reports undeclared file system entry check for File.#kind"() {
        Assume.assumeFalse("cannot use the file APIs in restricted DSL", isRestrictedDsl())

        def configurationCache = newConfigurationCacheFixture()

        UndeclaredFileAccess.FileCheck check = fileCheck(testDirectory)
        buildLogicApplication(check)
        def accessedFile = new File(check.filePath)

    /**
     * Views the location of this file as a {@link File}.
     */
    Provider<File> getAsFile();

    /**
     * Sets the location of this file, using a {@link File} instance. {@link File} instances with relative paths are resolved relative to the project directory of the project
     * that owns this property instance.
     */
    void set(@Nullable File file);

    /**

            println("exists = " + new File(projectDir, "file2.txt").exists())
            println("exists = " + new File(projectDir, "file3.txt").exists())
        """)

        when:
        file("gradle.properties") << """
            $IGNORE_FS_CHECKS_PROPERTY=file1.txt;file2.txt
        """
        configurationCacheRun()

        then:
        problems.assertResultHasProblems(result) {

        file("first/gradle/wrapper/gradle-wrapper.properties").md5Hash == file("second/gradle/wrapper/gradle-wrapper.properties").md5Hash
        file("first/gradlew").md5Hash == file("second/gradlew").md5Hash
        file("first/gradlew.bat").md5Hash == file("second/gradlew.bat").md5Hash
    }

    def "generated wrapper does not change unnecessarily"() {
        def wrapperJar = file("gradle/wrapper/gradle-wrapper.jar")