private SleepingRunnable sleeper;
  private Future<Boolean> delayedFuture;

  private final TearDownStack tearDownStack = new TearDownStack();

  @Override
  protected void setUp() {
    final ExecutorService executor = Executors.newSingleThreadExecutor();
    tearDownStack.addTearDown(
        new TearDown() {
          @Override
          public void tearDown() {
            executor.shutdownNow();

  private SleepingRunnable sleeper;
  private Future<Boolean> delayedFuture;

  private final TearDownStack tearDownStack = new TearDownStack();

  @Override
  protected void setUp() {
    final ExecutorService executor = Executors.newSingleThreadExecutor();
    tearDownStack.addTearDown(
        new TearDown() {
          @Override
          public void tearDown() {
            executor.shutdownNow();