queue.setMetaData(metaData);
        assertEquals(metaData, queue.getMetaData());

        queue.setMetaData(null);
        assertNull(queue.getMetaData());
    }

    public void test_encodingGetterSetter() {
        // Test encoding getter/setter
        UrlQueueImpl<Long> queue = new UrlQueueImpl<>();

        queue.setEncoding("UTF-8");
        assertEquals("UTF-8", queue.getEncoding());