when:
        deleter.ensureEmptyDirectory(target, true)

        then:
        target.assertIsEmptyDir()
        linked.assertIsEmptyDir()
        Files.readSymbolicLink(target.toPath()) == linked.toPath()
        content.assertDoesNotExist()
    }

    @Requires(UnitTestPreconditions.Symlinks)

For troubleshooting, visit https://help.gradle.org

BUILD SUCCESSFUL"""

        and:
        // Directory is still empty
        testDirectory.assertIsEmptyDir()

        and:
        // Uses a directory under the user home for those things that happen to need a cache directory
        executer.gradleUserHomeDir.file(BuildScopeCacheDir.UNDEFINED_BUILD).assertIsDir()

        then:
        executedAndNotSkipped ":customTask"
        file("build/empty").assertIsEmptyDir()

        when:
        cleanBuildDir()
        withBuildCache().run "customTask"
        then:
        skipped ":customTask"
        file("build/empty").assertIsEmptyDir()
    }

    @ToBeFixedForConfigurationCache(skip = INVESTIGATE)

        def customFile = file("customFile").touch()
        def myTaskDir = file("external/output").createDir()

        when:
        succeeds("myTask")
        then:
        dirInBuildDir.assertIsEmptyDir()
        customFile.assertDoesNotExist()
        buildFile.assertExists()
        // We should improve this eventually.  We currently don't delete _all_ outputs from every task

        def javaHome = new File(temporaryFolder, "localGradle").tap { mkdirs() }
        def metadata = detector.getMetadata(testLocation(javaHome))

        then:
        metadata
        tmpDir.assertIsEmptyDir()
    }

    def "can detect metadata of #displayName"() {
        given:
        def execHandleFactory = createExecHandleFactory(systemProperties)

        when:

     */
    public TestFile assertContainsDescendants(String... descendants) {
        return assertContainsDescendants(Arrays.asList(descendants));
    }

    public TestFile assertIsEmptyDir() {
        assertHasDescendants();
        return this;
    }

    public Set<String> allDescendants() {
        Set<String> names = new TreeSet<>();
        if (isDirectory()) {