Set<Map.Entry<String, Object>> parentEntrySet = parentMap.entrySet();
        assertEquals(parentEntrySet, entrySet);
    }

    @Test
    public void test_entrySet_with_lang_key() {
        Map<String, Object> parentMap = new LinkedHashMap<>();
        DocMap docMap = new DocMap(parentMap);

        docMap.put("zebra", "value1");
        docMap.put("apple", "value2");