assertTrue(paramMap.containsKey("ccc.ddd"));
        assertFalse(paramMap.containsKey("cccDdd"));
        assertFalse(paramMap.containsKey("DccDdd"));
    }

    public void test_camel_get() {
        Map<Object, Object> paramMap = createCamelMap();

        assertNull(paramMap.get("xxx"));
        assertEquals("111", paramMap.get("aaa"));
        assertEquals("222", paramMap.get("aaa_bbb"));

        }
        String keyStr = key.toString();
        if (keyStr.indexOf('_') < 0) {
            keyStr = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, StringUtils.uncapitalize(keyStr));
        } else {
            keyStr = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, keyStr);
        }
        return keyStr;
    }

    @Override
    public int size() {
        return parent.size();
    }

    public boolean isPrettyPrintSuppressed() {
        return false;
    }

    @Override
    public JsonMappingOption provideMappingOption() {
        return new JsonMappingOption().asFieldNaming(JsonFieldNaming.CAMEL_TO_LOWER_SNAKE);
    }

        return source;
    }

    protected Map<String, Object> toLowerHyphen(final Map<String, Object> source) {
        return source.entrySet().stream()
                .collect(Collectors.toMap(e -> CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, e.getKey()), e -> {
                    final Object value = e.getValue();
                    if (value instanceof Map) {
                        @SuppressWarnings("unchecked")