*
     * @param rootDir the root directory (must not be {@literal null})
     * @param handler the handler to process classes (must not be {@literal null})
     */
    public static void forEach(final File rootDir, final ClassHandler handler) {
        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**

    @TestSubtype
    public Mall<Outdoor>.Shop<Electronics> innerTypeIsSubtype(
        Mall<Outdoor>.Retailer<Electronics> retailer) {
      return isSubtype(retailer);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public Mall<Outdoor>.Shop<? extends Electronics> innerTypeIsSubtype_supertypeWithWildcard(
        Mall<Outdoor>.Retailer<Electronics> retailer) {

    @TestSubtype
    public Mall<Outdoor>.Shop<Electronics> innerTypeIsSubtype(
        Mall<Outdoor>.Retailer<Electronics> retailer) {
      return isSubtype(retailer);
    }

    @TestSubtype(suppressGetSupertype = true, suppressGetSubtype = true)
    public Mall<Outdoor>.Shop<? extends Electronics> innerTypeIsSubtype_supertypeWithWildcard(
        Mall<Outdoor>.Retailer<Electronics> retailer) {

    static {
        addTraverserFactory("file", (url, rootPackage, rootDir) -> new FileSystemTraverser(getBaseDir(url, rootDir), rootPackage, rootDir));
        addTraverserFactory("jar", JarFileTraverser::new);
        addTraverserFactory("zip", (url, rootPackage,
                rootDir) -> new JarFileTraverser(JarFileUtil.create(new File(ZipFileUtil.toZipFilePath(url))), rootPackage, rootDir));
        addTraverserFactory("code-source",

     *
     * @param rootDir the root directory (must not be {@literal null})
     * @param handler the handler to process resources (must not be {@literal null})
     */
    public static void forEach(final File rootDir, final ResourceHandler handler) {
        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**

@NullUnmarked
public class FilesFileTraverserTest extends IoTestCase {

  private File rootDir;

  @Override
  public void setUp() throws IOException {
    rootDir = createTempDir();
  }

  public void testFileTraverser_emptyDirectory() throws Exception {
    assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir);
  }

  public void testFileTraverser_nonExistingFile() throws Exception {

        .isEqualTo("fooBar");
  }

  public void testConverter_nullConversions() {
    for (CaseFormat outer : CaseFormat.values()) {
      for (CaseFormat inner : CaseFormat.values()) {
        assertThat(outer.converterTo(inner).convert(null)).isNull();
        assertThat(outer.converterTo(inner).reverse().convert(null)).isNull();
      }
    }
  }

  public void testConverter_toString() {

     */
    @Test
    public void testForEachFile() throws Exception {
        final File rootDir = ResourceUtil.getBuildDir(getClass());
        final String path = ResourceUtil.getResourcePath(getClass());
        final int pos = path.lastIndexOf("/");
        final String baseDirectory = path.substring(0, pos);
        ResourceTraversalUtil.forEach(rootDir, baseDirectory, (ResourceHandler) (path1, is) -> {
            try {

public class SynchronizedDequeTest extends TestCase {

  protected Deque<String> create() {
    TestDeque<String> inner = new TestDeque<>();
    Deque<String> outer = Synchronized.deque(inner, inner.mutex);
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestDeque<E> implements Deque<E> {
    private final Deque<E> delegate = new LinkedList<>();

public class SynchronizedDequeTest extends TestCase {

  protected Deque<String> create() {
    TestDeque<String> inner = new TestDeque<>();
    Deque<String> outer = Synchronized.deque(inner, inner.mutex);
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestDeque<E> implements Deque<E> {
    private final Deque<E> delegate = new LinkedList<>();