### Question:
ConfigUtil { public int getReadTimeout() { return readTimeout; } 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 testCustomizeReadTimeout() throws Exception { int someReadTimeout = 1; System.setProperty("apollo.readTimeout", String.valueOf(someReadTimeout)); ConfigUtil configUtil = new ConfigUtil(); assertEquals(someReadTimeout, configUtil.getReadTimeout()); }
@Test public void testCustomizeInvalidReadTimeout() throws Exception { String someInvalidReadTimeout = "a"; System.setProperty("apollo.readTimeout", someInvalidReadTimeout); ConfigUtil configUtil = new ConfigUtil(); assertTrue(configUtil.getReadTimeout() > 0); }