assertEquals(lastModified, queue.getLastModified());
        assertEquals(createTime, queue.getCreateTime());
        assertEquals(weight, queue.getWeight(), 0.001f);
    }

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