@Test
    public void test_serialization() {
        DocList docList = new DocList();

        assertTrue(docList instanceof java.io.Serializable);
    }

    @Test
    public void test_large_values() {
        DocList docList = new DocList();

        long largeValue = Long.MAX_VALUE - 1000;

        docList.addContentSize(largeValue);
        assertEquals(largeValue, docList.getContentSize());