code: def run_async(self, func, /, *args, delay=0, **kwargs):
      self._executor.submit(
          self._call_after_delay, func, *args, **kwargs, delay=delay
      )
  
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 4 for calling the TestThreadingMock obj's underlying member method code with example usage: obj.run_async() without return types