Service a = new NoOpDelayedService(50);
    ServiceManager manager = new ServiceManager(asList(a));
    manager.startAsync();
    assertThrows(TimeoutException.class, () -> manager.awaitHealthy(1, MILLISECONDS));
    manager.awaitHealthy(5, SECONDS); // no exception thrown

    manager.stopAsync();
    assertThrows(TimeoutException.class, () -> manager.awaitStopped(1, MILLISECONDS));