TestApplication application = new TestApplication();
    ExecutorService service = mock(ExecutorService.class);
    application.addDelayedShutdownHook(service, 2, SECONDS);
    when(service.awaitTermination(2, SECONDS)).thenThrow(new InterruptedException());
    application.shutdown();
    verify(service).shutdown();
  }

  public void testGetExitingExecutorService_executorSetToUseDaemonThreads() {