code: def test_instance_check(self):
      waitable_mock = self._make_mock()
  
      with patch(f"{__name__}.Something", waitable_mock):
          something = Something()
  
          self.assertIsInstance(something.method_1, ThreadingMock)
          self.assertIsInstance(
              something.method_1().method_2(), ThreadingMock
          )
  
imports: import time
  import unittest
  import concurrent.futures
  from test.support import threading_helper
  from unittest.mock import patch, ThreadingMock
label_desc: Use image node_id 8 for calling the TestThreadingMock obj's underlying member method code with example usage: obj.test_instance_check() without return types