docList.addContentSize(100);
        docList.addContentSize(0);
        assertEquals(100, docList.getContentSize());
    }

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

        docList.addProcessingTime(0);
        assertEquals(0, docList.getProcessingTime());

        docList.addProcessingTime(100);