@GwtIncompatible // serialization
  private static void reserializeAndAssert(Object object) throws Exception {
    Object copy = reserialize(object);
    assertEquals(object, copy);
    assertEquals(object.getClass(), copy.getClass());
  }

  @J2ktIncompatible
  @GwtIncompatible // serialization
  private static Object reserialize(Object object) throws Exception {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();

                Throwable.class,
                new Function<Throwable, Class<?>>() {
                  @Override
                  public Class<?> apply(Throwable input) {
                    return input.getClass();
                  }
                },
                directExecutor());
    assertThat(f.get()).isEqualTo(CustomRuntimeException.class);
  }

  public void testCatchingAsync() throws Exception {

    static final ClassOwnership JVM_BEHAVIOR = detectJvmBehavior();

    private static ClassOwnership detectJvmBehavior() {
      class LocalClass<T> {}
      Class<?> subclass = new LocalClass<String>() {}.getClass();
      // requireNonNull is safe because we're examining a type that's known to have a superclass.
      ParameterizedType parameterizedType =
          requireNonNull((ParameterizedType) subclass.getGenericSuperclass());

    assertEquals("Subscriber should be available.", subscriber, handler.context.getSubscriber());
    assertEquals(
        "Method should be available.",
        subscriber.getClass().getMethod("throwExceptionOn", String.class),
        handler.context.getSubscriberMethod());
  }

  public void testSubscriberThrowsExceptionHandlerThrowsException() throws Exception {
    final EventBus eventBus =

    assertEquals("Subscriber should be available.", subscriber, handler.context.getSubscriber());
    assertEquals(
        "Method should be available.",
        subscriber.getClass().getMethod("throwExceptionOn", String.class),
        handler.context.getSubscriberMethod());
  }

  public void testSubscriberThrowsExceptionHandlerThrowsException() throws Exception {
    final EventBus eventBus =

    }

    assertEquals(expectedResult, actualResult);
    if (expectedRuntimeException != null) {
      assertNotNull(actualRuntimeException);
      assertEquals(expectedRuntimeException.getClass(), actualRuntimeException.getClass());
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  private static void checkSerialization(Predicate<? super @Nullable Integer> predicate) {

      oos.flush();
      oos.close();
      ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
      T clone = (T) ois.readObject();
      assertSame(o.getClass(), clone.getClass());
      return clone;
    } catch (Throwable t) {
      threadUnexpectedException(t);
      return null;
    }
  }

    abstract boolean isPermitted(Exception exception);

    void assertPermitted(Exception exception) {
      if (!isPermitted(exception)) {
        String message =
            "Exception "
                + exception.getClass().getSimpleName()
                + " was thrown; expected "
                + getMessage();
        Helpers.fail(exception, message);
      }
    }

    private static final long serialVersionUID = 0;

    assertEquals(null, ourType.getOwnerType());
  }

  public void testNewParameterizedType_nonStaticLocalClass() {
    class LocalClass<T> {}
    Type jvmType = new LocalClass<String>() {}.getClass().getGenericSuperclass();
    Type ourType = Types.newParameterizedType(LocalClass.class, String.class);
    assertEquals(jvmType, ourType);
  }

  public void testNewParameterizedType_staticLocalClass() {

  public String toString() {
    // TODO(cpovirk): Presize to something plausible?
    StringBuilder builder = new StringBuilder();
    if (getClass().getName().startsWith("com.google.common.util.concurrent.")) {
      builder.append(getClass().getSimpleName());
    } else {
      builder.append(getClass().getName());
    }
    builder.append('@').append(toHexString(identityHashCode(this))).append("[status=");
    if (isCancelled()) {