public void testStop_failed() {
    Exception exception = new Exception("deliberate");
    TestService service =
        new TestService() {
          @Override
          protected void shutDown() throws Exception {
            super.shutDown();
            throw exception;
          }
        };
    service.startAsync().awaitRunning();
    assertEquals(1, service.startUpCalled);
    assertEquals(0, service.shutDownCalled);

    ignoreIoExceptions {
      socket.cancel()
    }

    // Release the threads.
    writerQueue.shutdown()
    pushQueue.shutdown()
    settingsListenerQueue.shutdown()
  }

  private fun failConnection(e: IOException?) {
    close(ErrorCode.PROTOCOL_ERROR, ErrorCode.PROTOCOL_ERROR, e)
  }

  /**

    return delegate().invokeAny(tasks, timeout, unit);
  }

  @Override
  public boolean isShutdown() {
    return delegate().isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return delegate().isTerminated();
  }

  @Override
  public void shutdown() {
    delegate().shutdown();
  }

  @Override
  @CanIgnoreReturnValue
  public List<Runnable> shutdownNow() {

      }
    }

  private val backend = TaskRunner.RealBackend(threadFactory)
  private val taskRunner = TaskRunner(backend)
  private val queue = taskRunner.newQueue()

  @AfterEach fun tearDown() {
    backend.shutdown()
  }

  @Test fun test() {
    val t1 = System.nanoTime() / 1e6

    val delays = mutableListOf(TimeUnit.MILLISECONDS.toNanos(1000), -1L)
    queue.schedule("task", TimeUnit.MILLISECONDS.toNanos(750)) {

* router (as in FastAPI's router): router (do not change if it's already translated to "roteador" or "roteadores")
* response (as in HTTP response): response (do not change if it's already translated to resposta)
* shutdown (of the app): encerramento
* shutdown event (of the app): evento de encerramento
* startup (as in the event of the app): inicialização
* startup event (as in the event of the app): evento de inicialização
* Stream: Stream
* string: string

  private final ListeningExecutorService delegate = newDirectExecutorService();

  @Override
  public void shutdown() {
    delegate.shutdown();
  }

  @Override
  public List<Runnable> shutdownNow() {
    return delegate.shutdownNow();
  }

  @Override
  public boolean isShutdown() {
    return delegate.isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return delegate.isTerminated();
  }

  private final ListeningExecutorService delegate = newDirectExecutorService();

  @Override
  public void shutdown() {
    delegate.shutdown();
  }

  @Override
  public List<Runnable> shutdownNow() {
    return delegate.shutdownNow();
  }

  @Override
  public boolean isShutdown() {
    return delegate.isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return delegate.isTerminated();
  }

    Request request = new Request.Builder()
        .url("ws://echo.websocket.org")
        .build();
    client.newWebSocket(request, this);

    // Trigger shutdown of the dispatcher's executor so this process exits immediately.
    client.dispatcher().executorService().shutdown();
  }

  @Override public void onOpen(WebSocket webSocket, Response response) {
    webSocket.send("Hello...");
    webSocket.send("...World!");

    return delegate().invokeAny(tasks, timeout, unit);
  }

  @Override
  public boolean isShutdown() {
    return delegate().isShutdown();
  }

  @Override
  public boolean isTerminated() {
    return delegate().isTerminated();
  }

  @Override
  public void shutdown() {
    delegate().shutdown();
  }

  @Override
  @CanIgnoreReturnValue
  public List<Runnable> shutdownNow() {

# 测试事件：启动 - 关闭

使用 `TestClient` 和 `with` 语句，在测试中运行事件处理器（`startup` 与 `shutdown`）。