// Verify no items were added
        final OpenSearchUrlQueue polled = urlQueueService.poll(sessionId);
        assertNull(polled);
    }

    @Test
    public void test_offerAll_duplicateUrlsTx() {
        final String sessionId = "offer_session2";
        final List<OpenSearchUrlQueue> urlQueueList = new ArrayList<>();

        final OpenSearchUrlQueue urlQueue1 = new OpenSearchUrlQueue();