assertFalse(result);
    }

    /**
     * Test isValid method with depth exceeding maxDepth.
     */
    public void test_isValid_exceedsMaxDepth() throws Exception {
        final UrlQueue<?> urlQueue = new UrlQueueImpl<>();
        urlQueue.setUrl("http://example.com/");
        urlQueue.setDepth(5); // Exceeds maxDepth of 3