}

  public void testServiceStartStop() {
    Service a = new NoOpService();
    Service b = new NoOpService();
    ServiceManager manager = new ServiceManager(asList(a, b));
    RecordingListener listener = new RecordingListener();
    manager.addListener(listener, directExecutor());
    assertState(manager, Service.State.NEW, a, b);
    assertFalse(manager.isHealthy());
    manager.startAsync().awaitHealthy();