### Question:
IdUserGroup { @VisibleForTesting public long getTimeout() { return timeout; } IdUserGroup();  IdUserGroup(Configuration conf); @VisibleForTesting long getTimeout(); @VisibleForTesting static void updateMapInternal(BiMap<Integer, String> map, String mapName,
      String command, String regex); synchronized void updateMaps(); synchronized int getUid(String user); synchronized int getGid(String group); synchronized String getUserName(int uid, String unknown); synchronized String getGroupName(int gid, String unknown); int getUidAllowingUnknown(String user); int getGidAllowingUnknown(String group);  }### Answer:
@Test public void testUserUpdateSetting() throws IOException { IdUserGroup iug = new IdUserGroup(); assertEquals(iug.getTimeout(), IdUserGroup.TIMEOUT_DEFAULT); Configuration conf = new Configuration(); conf.setLong(IdUserGroup.NFS_USERUPDATE_MILLY, 0); iug = new IdUserGroup(conf); assertEquals(iug.getTimeout(), IdUserGroup.TIMEOUT_MIN); conf.setLong(IdUserGroup.NFS_USERUPDATE_MILLY, IdUserGroup.TIMEOUT_DEFAULT * 2); iug = new IdUserGroup(conf); assertEquals(iug.getTimeout(), IdUserGroup.TIMEOUT_DEFAULT * 2); }