code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
imports: import functools
  import os
  from pathlib import Path
  import pickle
  import sys
  import time
  import unittest
  import ray
  from ray.util.state import list_actors
  from ray.rllib.utils.actor_manager import FaultAwareApply, FaultTolerantActorManager
label_desc: Use image node_id 2 for calling the TestActorManager obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types