def test_wsgiMultithread(self):
        """
        The C{'wsgi.multithread'} key of the C{environ} C{dict} passed to the
        application is set to C{True}.
        """
        thread = self.render('GET', '1.1', [], [''])
        thread.addCallback(self.environKeyEqual('wsgi.multithread', True))
        return thread

        The C{'wsgi.multithread'} key of the C{environ} C{dict} passed to the
        application is set to C{True}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_wsgi.py