code: def tearDown(self):
      disconnect()
  
imports: import unittest
  import parl
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  from parl.remote.client import disconnect
  from parl.utils import logger, _IS_WINDOWS
  import os
  import threading
  import time
  import subprocess
  from parl.utils import get_free_tcp_port
label_desc: Use image node_id 1 for calling the TestJobAlone obj's underlying member method code with example usage: obj.tearDown() without return types