@AfterClass
  public static void stopServices() throws Exception {
    System.getenv().remove("HMS_JWT");
  }
This is a hack to make environment variables modifiable.
Ref: https://stackoverflow.com/questions/318239/how-do-i-set-environment-variables-from-java.
standalone-metastore/metastore-server/src/test/java/org/apache/hadoop/hive/metastore/TestRemoteHiveMetastoreWithHttpJwt.java