String result = queue.toString();
        assertNotNull(result);
        assertTrue(result.contains("UrlQueueImpl"));
    }

    public void test_complexScenario() {
        // Test complex scenario with all fields
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        Long id = 999L;
        String sessionId = "crawl-session-123";

        assertEquals(Method.GET, Method.valueOf("GET"));
        assertEquals(Method.POST, Method.valueOf("POST"));
        assertEquals(Method.HEAD, Method.valueOf("HEAD"));
    }

    public void test_complexScenario() {
        // Test a complex scenario with multiple operations
        RequestData data = new RequestData();

        // Set values
        data.setMethod("POST");