@Override
  @After
  public void tearDown() throws Exception {
    session_src.executeNonQueryStatement("drop user " + userName);
    try {
      consumer.close();
    } catch (Exception e) {
    }
    subs.dropTopic(topicName);
    dropDB(database);
    super.tearDown();
  }
Permission Test: Username currently only serves for connection, no permissions defined.
integration-test/src/test/java/org/apache/iotdb/subscription/it/triple/treemodel/regression/user/IoTDBOtherUserConsumerIT.java