.isNull();
  }

  public void testServiceStartStop() throws Exception {
    WaitOnRunService service = new WaitOnRunService();
    assertFalse(service.startUpCalled);

    service.startAsync().awaitRunning();
    assertTrue(service.startUpCalled);
    assertEquals(Service.State.RUNNING, service.state());

    enterRun.await(); // to avoid stopping the service until run() is invoked

    service.startAsync().awaitRunning();
    assertEquals(State.RUNNING, service.state());

    service.stopAsync().awaitTerminated();
    assertEquals(State.TERMINATED, service.state());
  }

  public void testNoOpServiceStartAsyncAndAwaitStopAsyncAndAwait() throws Exception {
    NoOpService service = new NoOpService();

    service.startAsync().awaitRunning();
    assertEquals(State.RUNNING, service.state());

    service.startAsync().awaitRunning();
    assertEquals(State.RUNNING, service.state());

    service.stopAsync().awaitTerminated();
    assertEquals(State.TERMINATED, service.state());
  }

  public void testNoOpServiceStartAsyncAndAwaitStopAsyncAndAwait() throws Exception {
    NoOpService service = new NoOpService();

    service.startAsync().awaitRunning();
    assertEquals(State.RUNNING, service.state());

        .isNull();
  }

  public void testServiceStartStop() throws Exception {
    WaitOnRunService service = new WaitOnRunService();
    assertFalse(service.startUpCalled);

    service.startAsync().awaitRunning();
    assertTrue(service.startUpCalled);
    assertEquals(Service.State.RUNNING, service.state());

    enterRun.await(); // to avoid stopping the service until run() is invoked

          }
        };

    assertThrows(IllegalStateException.class, () -> service.startAsync().awaitRunning());

    assertTrue(executor.get().awaitTermination(100, MILLISECONDS));
  }

  public void testSchedulerOnlyCalledOnce() throws Exception {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    // It should be called once during startup.

          }
        };

    assertThrows(IllegalStateException.class, () -> service.startAsync().awaitRunning());

    assertTrue(executor.get().awaitTermination(100, MILLISECONDS));
  }

  public void testSchedulerOnlyCalledOnce() throws Exception {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    // It should be called once during startup.

   *     enter the {@link State#RUNNING} state. e.g. if the {@code state} is {@code
   *     State#TERMINATED} when this method is called then this will throw an IllegalStateException.
   * @since 15.0
   */
  void awaitRunning();

  /**
   * Waits for the {@link Service} to reach the {@linkplain State#RUNNING running state} for no more
   * than the given time.
   *
   * @param timeout the maximum time to wait

      }
    }
    return this;
  }

  @Override
  public final void awaitRunning() {
    monitor.enterWhenUninterruptibly(hasReachedRunning);
    try {
      checkCurrentState(RUNNING);
    } finally {
      monitor.leave();
    }
  }

  @Override
  public final void awaitRunning(long timeout, TimeUnit unit) throws TimeoutException {

            return delegate.stopAsync();
          }

          @Override
          public final void awaitRunning() {
            delegate.awaitRunning();
          }

          @Override
          public final void awaitRunning(long timeout, TimeUnit unit) throws TimeoutException {
            delegate.awaitRunning(timeout, unit);
          }

          @Override
          public final void awaitTerminated() {

            return delegate.stopAsync();
          }

          @Override
          public final void awaitRunning() {
            delegate.awaitRunning();
          }

          @Override
          public final void awaitRunning(long timeout, TimeUnit unit) throws TimeoutException {
            delegate.awaitRunning(timeout, unit);
          }

          @Override
          public final void awaitTerminated() {