return
			}
		case "Reads":
			z.Reads, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "Reads")
				return
			}
		case "LockQueue":
			z.LockQueue, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "LockQueue")
				return
			}
		case "LocksAbandoned":
			z.LocksAbandoned, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "LocksAbandoned")

type lockStats struct {
	Total          int
	Writes         int
	Reads          int
	LockQueue      int
	LocksAbandoned int
	LastCleanup    *time.Time
}

func (l *localLocker) stats() lockStats {
	return lockStats{
		Total:       len(l.lockMap),
		Reads:       int(l.readers.Load()),
		Writes:      int(l.writers.Load()),
		LockQueue:   int(l.waitMutex.Load()),
		LastCleanup: l.lastCleanup.Load(),
	}
}

        String url = "https://example.com/page";
        Queue<UrlQueueImpl<Long>> mockQueue = new LinkedList<>();

        when(dataHelper.getUrlQueueList(sessionId)).thenReturn(mockQueue);

        // Execute
        service.add(sessionId, url);

        // Verify
        assertEquals(1, mockQueue.size());
        UrlQueueImpl<Long> added = mockQueue.peek();
        assertNotNull(added);