@Override
        public void run() {
          Uninterruptibles.sleepUninterruptibly(delay, TimeUnit.MILLISECONDS);
          notifyStarted();
        }
      }.start();
    }

    @Override
    protected void doStop() {
      new Thread() {
        @Override
        public void run() {
          Uninterruptibles.sleepUninterruptibly(delay, TimeUnit.MILLISECONDS);
          notifyStopped();
        }

        @Override
        public void run() {
          Uninterruptibles.sleepUninterruptibly(delay, TimeUnit.MILLISECONDS);
          notifyStarted();
        }
      }.start();
    }

    @Override
    protected void doStop() {
      new Thread() {
        @Override
        public void run() {
          Uninterruptibles.sleepUninterruptibly(delay, TimeUnit.MILLISECONDS);
          notifyStopped();
        }

  @J2ktIncompatible
  @GwtIncompatible // concurrency
  @SuppressWarnings("GoodTime") // should accept a java.time.Duration
  public static void sleepUninterruptibly(long sleepFor, TimeUnit unit) {
    boolean interrupted = false;
    try {
      long remainingNanos = unit.toNanos(sleepFor);
      long end = System.nanoTime() + remainingNanos;
      while (true) {

    @Override
    protected void doAction() {}
  }

  private static void sleepSuccessfully(long sleepMillis) {
    Completion completed = new Completion(sleepMillis - SLEEP_SLACK);
    Uninterruptibles.sleepUninterruptibly(sleepMillis, MILLISECONDS);
    completed.assertCompletionExpected();
  }

  private static void assertTimeNotPassed(Stopwatch stopwatch, long timelimitMillis) {

          return stopwatch.elapsed(MICROSECONDS);
        }

        @Override
        protected void sleepMicrosUninterruptibly(long micros) {
          if (micros > 0) {
            Uninterruptibles.sleepUninterruptibly(micros, MICROSECONDS);
          }
        }
      };
    }
  }

  private static void checkPermits(int permits) {
    checkArgument(permits > 0, "Requested permits (%s) must be positive", permits);

    @Override
    protected void doAction() {}
  }

  private static void sleepSuccessfully(long sleepMillis) {
    Completion completed = new Completion(sleepMillis - SLEEP_SLACK);
    Uninterruptibles.sleepUninterruptibly(sleepMillis, MILLISECONDS);
    completed.assertCompletionExpected();
  }

  private static void assertTimeNotPassed(Stopwatch stopwatch, long timelimitMillis) {