* it returns {@link Executors#defaultThreadFactory()}.
   *
   * @since 14.0
   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  public static ThreadFactory platformThreadFactory() {
    if (!isAppEngineWithApiClasses()) {
      return defaultThreadFactory();
    }
    try {
      return (ThreadFactory)
          Class.forName("com.google.appengine.api.ThreadManager")

    application.shutdown();
    verify(executor).shutdown();
  }

  public void testPlatformThreadFactory_default() {
    ThreadFactory factory = MoreExecutors.platformThreadFactory();
    assertThat(factory).isNotNull();
    // Executors#defaultThreadFactory() may return a new instance each time.
    assertEquals(factory.getClass(), Executors.defaultThreadFactory().getClass());
  }

    application.shutdown();
    verify(executor).shutdown();
  }

  public void testPlatformThreadFactory_default() {
    ThreadFactory factory = MoreExecutors.platformThreadFactory();
    assertThat(factory).isNotNull();
    // Executors#defaultThreadFactory() may return a new instance each time.
    assertEquals(factory.getClass(), Executors.defaultThreadFactory().getClass());
  }