code: def _connect_and_create_actor(cluster_addr):
      parl.connect(cluster_addr)
      for _ in range(2):
          actor = Actor()
          ret = actor.add_one(1)
          assert ret == 2
      disconnect()
  
imports: import unittest
  import parl
  import time
  import threading
  import multiprocessing
  from parl.remote.master import Master
  from parl.remote.worker import Worker
  from parl.remote.client import disconnect
  from parl.utils import get_free_tcp_port, _IS_WINDOWS
label_desc: Use image node_id 2 for calling the TestCluster obj's underlying member method code with example usage: obj._connect_and_create_actor(cluster_addr) without return types