assertTrue(result.contains("GET"));
        assertTrue(result.contains("https://example.com"));
        assertTrue(result.contains("UTF-8"));
    }

    public void test_toStringWithNullValues() {
        // Test toString with null values
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        String result = queue.toString();
        assertNotNull(result);

        assertTrue(result.contains("GET"));
        assertTrue(result.contains("https://example.com"));
        assertTrue(result.contains("1.5"));
    }

    public void test_toStringWithNullValues() {
        // Test toString with null values
        RequestData data = new RequestData();

        String result = data.toString();
        assertNotNull(result);