assertTrue(Arrays.asList(keys).contains("banana"));
        assertTrue(Arrays.asList(keys).contains("zebra"));
    }

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

        docMap.put("c_key", "value_c");
        docMap.put("a_key", "value_a");