code: def _call_after_delay(self, func, /, *args, **kwargs):
      time.sleep(kwargs.pop("delay"))
      func(*args, **kwargs)
  
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 1 for calling the TestThreadingMock obj's underlying member method code with example usage: obj._call_after_delay() without return types