// Verify
        assertNotNull(result);
        assertEquals("https://example.com", result.getUrl());
        assertTrue(mockQueue.isEmpty());
    }

    public void test_pollEmptyQueue() {
        // Setup
        String sessionId = "session123";
        Queue<UrlQueueImpl<Long>> mockQueue = new LinkedList<>();

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