public synchronized <T> void persist(String topicName, T t) {
        // stub for future
        this.persist();
    }
@Test
    public void testPersist() throws Exception {
        ConfigManager testConfigManager = buildTestConfigManager();
        testConfigManager.persist();
        File file = new File(testConfigManager.configFilePath());
        assertEquals(CONTENT_ENCODE, MixAll.file2String(file));
    }