final OpenSearchUrlQueue polled2 = urlQueueService.poll(sessionId);
        assertNull(polled2);

        urlQueueService.delete(sessionId);
    }

    public void test_poll_multipleItemsTx() {
        final String sessionId = "poll_session3";
        final List<OpenSearchUrlQueue> urlQueueList = new ArrayList<>();

        for (int i = 1; i <= 5; i++) {