@Override
    protected boolean updateCacheIfNeed(final ConfigData<MetaData> result) {
        return updateCacheIfNeed(result, ConfigGroupEnum.META_DATA);
    }
@Test
    public void testUpdateCacheIfNeed() {
        final MetaDataRefresh metaDataRefresh = mockMetaDataRefresh;
        // update cache, then assert equals
        ConfigData<MetaData> expect = new ConfigData<>();
        expect.setLastModifyTime(System.currentTimeMillis());
        metaDataRefresh.updateCacheIfNeed(expect);
        assertThat(metaDataRefresh.cacheConfigData(), is(expect));
    }