assertEquals(3, values.size());
        assertTrue(values.contains("value1"));
        assertTrue(values.contains("value2"));
        assertTrue(values.contains("value3"));
    }

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

        docMap.put("key1", "value1");
        docMap.put("key2", "value2");