def test_hasAsyncIO(self):
        """
        --help-reactors should display the asyncio reactor on Python >= 3.4
        """
        self.assertIn(twisted_reactors.asyncio.description, self.message)
        self.assertNotIn(
            "!" + twisted_reactors.asyncio.shortName, self.message)

        --help-reactors should display the asyncio reactor on Python >= 3.4
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_application.py