code: def testClassMethodCall(self):
      result = self._client.method_add(12, 5)
      self.assertEqual(result, 17)
  
imports: from concurrent import futures
  import datetime
  import pickle
  import threading
  import time
  from typing import Optional, Union
  import zoneinfo
  from absl.testing import absltest
  from absl.testing import parameterized
  from courier.python import client
  from courier.python import py_server
  import mock
  import numpy
  from pybind11_abseil.status import StatusNotOk
label_desc: Use image node_id 5 for calling the PyIntegrationTest obj's underlying member method code with example usage: obj.testClassMethodCall() without return types