def test_extrasRequiresSerialDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{serial} extra contains setuptools requirements
        for the packages required to make Twisted's serial support work.
        """
        self.assertIn(
            'pyserial >= 3.0',
            _EXTRAS_REQUIRE['serial']
        )

        L{_EXTRAS_REQUIRE}'s C{serial} extra contains setuptools requirements
        for the packages required to make Twisted's serial support work.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_setup.py