### Question:
ConfigUtil { public int getLongPollQPS() { return longPollQPS; } ConfigUtil(); String getAppId(); String getDataCenter(); String getCluster(); Env getApolloEnv(); String getLocalIp(); String getMetaServerDomainName(); int getConnectTimeout(); int getReadTimeout(); int getRefreshInterval(); TimeUnit getRefreshIntervalTimeUnit(); int getLoadConfigQPS(); int getLongPollQPS(); long getOnErrorRetryInterval(); TimeUnit getOnErrorRetryIntervalTimeUnit(); String getDefaultLocalCacheDir(); boolean isInLocalMode(); boolean isOSWindows(); long getMaxConfigCacheSize(); long getConfigCacheExpireTime(); TimeUnit getConfigCacheExpireTimeUnit(); long getLongPollingInitialDelayInMills(); boolean isAutoUpdateInjectedSpringPropertiesEnabled();  }### Answer:
@Test public void testCustomizeLongPollQPS() throws Exception { int someQPS = 1; System.setProperty("apollo.longPollQPS", String.valueOf(someQPS)); ConfigUtil configUtil = new ConfigUtil(); assertEquals(someQPS, configUtil.getLongPollQPS()); }
@Test public void testCustomizeInvalidLongPollQPS() throws Exception { String someInvalidQPS = "a"; System.setProperty("apollo.longPollQPS", someInvalidQPS); ConfigUtil configUtil = new ConfigUtil(); assertTrue(configUtil.getLongPollQPS() > 0); }