assertEquals(0, docList.size());
        assertEquals(0, docList.getContentSize());
        assertEquals(0, docList.getProcessingTime());
    }

    @Test
    public void test_toString_empty() {
        DocList docList = new DocList();
        String result = docList.toString();

        assertTrue(result.contains("contentSize=0"));
        assertTrue(result.contains("processingTime=0"));