def test_wsgiVersion(self):
        """
        The C{'wsgi.version'} key of the C{environ} C{dict} passed to the
        application has the value C{(1, 0)} indicating that this is a WSGI 1.0
        container.
        """
        versionDeferred = self.render('GET', '1.1', [], [''])
        versionDeferred.addCallback(self.environKeyEqual('wsgi.version', (1, 0)))
        return versionDeferred

        The C{'wsgi.version'} key of the C{environ} C{dict} passed to the
        application has the value C{(1, 0)} indicating that this is a WSGI 1.0
        container.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_wsgi.py