code: def tearDownClass(cls):
      # Stop the test server and join the thread.
      cls._server.stop_server().wait()
      cls._server_thread.join()
      cls._server_2.stop_server().wait()
      cls._server_thread_2.join()
      test_util.TensorFlowTestCase.tearDownClass()
  
imports: import os
  import traceback
  import grpc
  from tensorflow.core.debug import debug_service_pb2
  from tensorflow.python.client import session
  from tensorflow.python.debug.lib import grpc_debug_test_server
  from tensorflow.python.debug.lib import source_remote
  from tensorflow.python.debug.lib import source_utils
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import googletest
  from tensorflow.python.platform import test
  from tensorflow.python.util import tf_inspect
label_desc: Use image node_id 2 for calling the SendTracebacksTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types