public ParameterTypesDifferent apply(ParameterTypesDifferent delegate) {
            return new ParameterTypesDifferentForwarder(delegate);
          }
        });
  }

  public void testVoidMethodForwarding() {
    tester.testForwarding(
        Runnable.class,
        new Function<Runnable, Runnable>() {
          @Override
          public Runnable apply(final Runnable runnable) {