// Execute
        service.offerAll(sessionId, newUrlList);

        // Verify
        assertEquals(2, existingQueue.size());
    }

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

        UrlQueueImpl<Long> existing = new UrlQueueImpl<>();