@AfterClass
  public static void stopServices() throws Exception {
    if (miniHS2 != null && miniHS2.isStarted()) {
      miniHS2.stop();
      miniHS2.cleanup();
      miniHS2 = null;
      MiniHS2.cleanupLocalDir();
    }
  }
This is a hack to make environment variables modifiable.
Ref: https://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java.
itests/hive-unit/src/test/java/org/apache/hive/service/auth/jwt/TestHttpJwtAuthentication.java