assertEquals(30, docList.getProcessingTime());

        docList.addProcessingTime(5);
        assertEquals(35, docList.getProcessingTime());
    }

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

        docList.addContentSize(100);
        assertEquals(100, docList.getContentSize());

        docList.addContentSize(-30);