public void test_delete() {
        // Setup
        String sessionId = "session123";

        // Execute
        service.delete(sessionId);

        // Verify
        verify(dataHelper).removeUrlQueueList(sessionId);
    }

    public void test_deleteAll() {
        // Execute
        service.deleteAll();

        // Verify
        verify(dataHelper).clearUrlQueueList();
    }