def test_extrasRequiresDevDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{dev} extra contains setuptools requirements for
        the tools required for Twisted development.
        """
        deps = _EXTRAS_REQUIRE['dev']
        self.assertIn('pyflakes >= 1.0.0', deps)
        self.assertIn('twisted-dev-tools >= 0.0.2', deps)
        self.assertIn('python-subunit', deps)
        self.assertIn('sphinx >= 1.3.1', deps)
        if not _PY3:
            self.assertIn('twistedchecker >= 0.4.0', deps)
            self.assertIn('pydoctor >= 16.2.0', deps)

        L{_EXTRAS_REQUIRE}'s C{dev} extra contains setuptools requirements for
        the tools required for Twisted development.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_setup.py