code: def setUpClass(cls):
      test_util.TensorFlowTestCase.setUpClass()
      (
          cls._server_port,
          cls._debug_server_url,
          cls._server_dump_dir,
          cls._server_thread,
          cls._server,
      ) = grpc_debug_test_server.start_server_on_separate_thread(
          poll_server=True
      )
      cls._server_address = "localhost:%d" % cls._server_port
      (
          cls._server_port_2,
          cls._debug_server_url_2,
          cls._server_dump_dir_2,
          cls._server_thread_2,
          cls._server_2,
      ) = grpc_debug_test_server.start_server_on_separate_thread()
      cls._server_address_2 = "localhost:%d" % cls._server_port_2
      cls._curr_file_path = os.path.normpath(os.path.abspath(__file__))
  
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 1 for calling the SendTracebacksTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types