String accountName = (String) getField(obj, "accountName");
        String primaryDomain = (String) getField(obj, "primaryDomain");

        // The actual implementation keeps lowercase for guest when Unicode is not enabled
        assertEquals("guest", accountName);
        assertEquals("DOM", primaryDomain);

        byte[] lm = (byte[]) getField(obj, "lmHash");

        manager.requestDurableHandle("/test/file.txt", HandleType.DURABLE_V2, 100, // 100ms timeout
                null);

        // Wait for expiration
        try {
            Thread.sleep(150);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        HandleInfo info = manager.getHandleForReconnect("/test/file.txt");
        assertNull(info);

        new Callable<@Nullable Void>() {
          @Override
          public @Nullable Void call() throws Exception {
            // adds two nanoseconds to the ticker
            ticker.advance(1L);
            Thread.sleep(10);
            ticker.advance(1L);
            return null;
          }
        });

    assertEquals(numberOfThreads * 2, ticker.read());
  }

  @GwtIncompatible // concurrency

        // Make the cache entry expired
        DirectoryCacheEntry entry = directoryLeaseManager.getCacheEntry(directoryPath);
        entry.setMaxAge(1); // 1ms to expire immediately
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            // Ignore
        }

        // When lease is lost, cache entry should be removed
        when(baseLeaseManager.getLease(leaseKey)).thenReturn(null);

        FtpClient client = new FtpClient() {
            @Override
            protected ResponseData getResponseData(final String uri, final boolean includeContent) {
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    throw new CrawlingAccessException(e);
                }
                return null;
            }
        };

        IOException error = new IOException("Connection failed");
        failover.handleFailure(failedChannel, error);

        // Wait a bit for recovery attempt
        Thread.sleep(100);

        verify(mockChannelManager).createTransport(failedChannel.getLocalInterface(), failedChannel.getRemoteInterface());
    }

    @Test
    void testMultipleFailuresExceedRetryLimit() {

            @Override
            public void run() {
                try {
                    statusSetLatch.countDown();
                    // Poll for status change instead of fixed sleep
                    long startTime = System.currentTimeMillis();
                    while (System.currentTimeMillis() - startTime < 500) {
                        if (CrawlerStatus.DONE == crawlerContext.getStatus()) {

    MockReference(FinalizableReferenceQueue frq) {
      super(new Object(), frq);
    }

    @Override
    public void finalizeReferent() {
      finalizeReferentCalled = true;
    }
  }

  /**
   * Keeps a weak reference to the underlying reference queue. When this reference is cleared, we
   * know that the background thread has stopped and released its strong reference.
   */

                    crawlerStatusList.set(startedCrawlerNum, Constants.RUNNING);
                    startedCrawlerNum++;
                    activeCrawlerNum++;
                    ThreadUtil.sleep(crawlingExecutionInterval);
                    continue;
                }

                // check status
                for (int i = 0; i < startedCrawlerNum; i++) {

    while (!isThreadBlockedOnInstanceOf(t, blocker)) {
      if (t.getState() == Thread.State.TERMINATED) {
        throw new RuntimeException("Thread " + t + " exited unexpectedly");
      }
      Thread.sleep(1);
    }
  }

  private static boolean isThreadBlockedOnInstanceOf(Thread t, Class<?> blocker) {
    return t.getState() == Thread.State.WAITING && blocker.isInstance(LockSupport.getBlocker(t));
  }