def test_lacksAsyncIO(self):
        """
        --help-reactors should NOT display the asyncio reactor on Python < 3.4
        """
        self.assertIn(twisted_reactors.asyncio.description, self.message)
        self.assertIn("!" + twisted_reactors.asyncio.shortName, self.message)

        --help-reactors should NOT display the asyncio reactor on Python < 3.4
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_application.py