code: def test_custom_factory(self):
      loop = mock.Mock()
      with asyncio.Runner(loop_factory=lambda: loop) as runner:
          self.assertIs(runner.get_loop(), loop)
  
imports: import _thread
  import asyncio
  import contextvars
  import re
  import signal
  import sys
  import threading
  import unittest
  from test.test_asyncio import utils
  from unittest import mock
  from unittest.mock import patch
label_desc: Use image node_id 3 for calling the RunnerTests obj's underlying member method code with example usage: obj.test_custom_factory() without return types