code: def test_double_close(self):
      runner = asyncio.Runner()
      loop = runner.get_loop()
  
      runner.close()
      self.assertTrue(loop.is_closed())
  
      # the second call is no-op
      runner.close()
      self.assertTrue(loop.is_closed())
  
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 8 for calling the RunnerTests obj's underlying member method code with example usage: obj.test_double_close() without return types