// Test that UrlQueueImpl implements UrlQueue
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();
        assertTrue(queue instanceof UrlQueue);
    }

    public void test_genericTypeFlexibility() {
        // Test with different generic types
        UrlQueueImpl<Integer> intQueue = new UrlQueueImpl<>();
        intQueue.setId(42);
        assertEquals(Integer.valueOf(42), intQueue.getId());