code: def setUp(self):
      self.server_exited = False
      self.client_exited = False
  
file_path: PARL/parl/remote/grpc_heartbeat/tests/heartbeat_server_arguments_test.py
imports: import time
  import unittest
  from parl.remote.grpc_heartbeat import HeartbeatServerThread
  from parl.remote.grpc_heartbeat import HeartbeatClientThread
  from parl.remote import remote_constants
label_desc: Use image node_id 1 for calling the TestHeartbeatServerArguments obj's underlying member method code with example usage: obj.setUp() without return types