assertEquals(1, qrList.size());
        assertTrue(qrList.contains(doc1));
        assertFalse(qrList.contains(doc3));
    }

    @Test
    public void test_equalsAndHashCode() {
        List<Map<String, Object>> documentList1 = new ArrayList<>();
        List<Map<String, Object>> documentList2 = new ArrayList<>();
        Map<String, Object> doc = new HashMap<>();