.addEqualityGroup(set2, wrap(set2))
        .testEquals();
  }

  private static <T> Set<T> wrap(Set<T> delegate) {
    return new ForwardingSet<T>() {
      @Override
      protected Set<T> delegate() {
        return delegate;
      }
    };
  }

    implements TestSetGenerator<E> {

  ReserializingTestSetGenerator(TestSetGenerator<E> delegate) {
    super(delegate);
  }

  public static <E> TestSetGenerator<E> newInstance(TestSetGenerator<E> delegate) {
    return new ReserializingTestSetGenerator<>(delegate);
  }

  @Override
  public Set<E> create(Object... elements) {
    return (Set<E>) super.create(elements);
  }

    }
  }

  private class ProgressRequestBody(
    private val delegate: RequestBody,
    private val progressListener: ProgressListener,
  ) : RequestBody() {
    override fun contentType() = delegate.contentType()

    @Throws(IOException::class)
    override fun contentLength(): Long = delegate.contentLength()

    @Throws(IOException::class)
    override fun writeTo(sink: BufferedSink) {

@NullUnmarked
class LockHeldAssertingSet<E> extends ForwardingSet<E> implements Serializable {
  final Set<E> delegate;
  final Object mutex;

  LockHeldAssertingSet(Set<E> delegate, Object mutex) {
    checkNotNull(mutex);
    this.delegate = delegate;
    this.mutex = mutex;
  }

  @Override
  protected Set<E> delegate() {
    return delegate;
  }

  @Override
  public String toString() {
    assertTrue(Thread.holdsLock(mutex));

  @Override
  protected abstract BlockingQueue<E> delegate();

  @CanIgnoreReturnValue
  @Override
  public int drainTo(Collection<? super E> c, int maxElements) {
    return delegate().drainTo(c, maxElements);
  }

  @CanIgnoreReturnValue
  @Override
  public int drainTo(Collection<? super E> c) {
    return delegate().drainTo(c);
  }

  @CanIgnoreReturnValue // TODO(kak): consider removing this

  private final Equivalence<? super T> equivalence;
  private final RelationshipTester<T> delegate;
  private final List<T> items = new ArrayList<>();

  private EquivalenceTester(Equivalence<? super T> equivalence) {
    this.equivalence = checkNotNull(equivalence);
    this.delegate =
        new RelationshipTester<>(
            equivalence, "equivalent", "hash", /* itemReporter= */ Item::toString);
  }

  static <E> ImmutableSet<E> asImmutable(Set<E> delegate) {
    switch (delegate.size()) {
      case 0:
        return ImmutableSet.of();
      case 1:
        return ImmutableSet.of(Iterables.getOnlyElement(delegate));
      default:
        return new ImmutableEnumSet<E>(delegate);
    }
  }

  public ImmutableEnumSet(Set<E> delegate) {
    super(delegate);
  }

  @Override
  protected abstract Map<K, V> delegate();

  @Override
  public int size() {
    return delegate().size();
  }

  @Override
  public boolean isEmpty() {
    return delegate().isEmpty();
  }

  @CanIgnoreReturnValue
  @Override
  public @Nullable V remove(@Nullable Object key) {
    return delegate().remove(key);
  }

  @Override
  public void clear() {

 */
internal class MockWebServerSocket(
  val javaNetSocket: Socket,
) : Closeable,
  BufferedSocket {
  private val delegate = javaNetSocket.asOkioSocket()
  private val closedLatch = CountDownLatch(2)

  override val source: BufferedSource =
    object : ForwardingSource(delegate.source) {
      private var closed = false

      override fun close() {
        if (closed) return
        try {

  }

  @Override
  public final boolean isRunning() {
    return delegate.isRunning();
  }

  @Override
  public final State state() {
    return delegate.state();
  }

  /**
   * @since 13.0
   */
  @Override
  public final void addListener(Listener listener, Executor executor) {
    delegate.addListener(listener, executor);
  }

  /**
   * @since 14.0
   */