verify(delegate).execute(task);
  }

  public void testListeningDecorator_scheduleSuccess() throws Exception {
    CountDownLatch completed = new CountDownLatch(1);
    ScheduledThreadPoolExecutor delegate =
        new ScheduledThreadPoolExecutor(1) {
          @Override
          protected void afterExecute(Runnable r, Throwable t) {
            completed.countDown();
          }
        };

    verify(delegate).execute(task);
  }

  public void testListeningDecorator_scheduleSuccess() throws Exception {
    CountDownLatch completed = new CountDownLatch(1);
    ScheduledThreadPoolExecutor delegate =
        new ScheduledThreadPoolExecutor(1) {
          @Override
          protected void afterExecute(Runnable r, Throwable t) {
            completed.countDown();
          }
        };

  public static ScheduledExecutorService getExitingScheduledExecutorService(
      ScheduledThreadPoolExecutor executor, Duration terminationTimeout) {
    return getExitingScheduledExecutorService(
        executor, toNanosSaturated(terminationTimeout), TimeUnit.NANOSECONDS);
  }

  /**
   * Converts the given ScheduledThreadPoolExecutor into a ScheduledExecutorService that exits when