queue.setEncoding("ISO-8859-1");
        assertEquals("ISO-8859-1", queue.getEncoding());

        queue.setEncoding(null);
        assertNull(queue.getEncoding());
    }

    public void test_parentUrlGetterSetter() {
        // Test parent URL getter/setter
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        String parentUrl = "https://example.com";
        queue.setParentUrl(parentUrl);