def test_getChildWithDefaultUnauthorizedUser(self):
        """
        Resource traversal which enouncters an L{HTTPAuthSessionWrapper}
        results in an L{UnauthorizedResource} when the request has an
        I{Authorization} header with a user which does not exist.
        """
        return self._invalidAuthorizationTest(
            b'Basic ' + b64encode(b'foo:bar'))

        Resource traversal which enouncters an L{HTTPAuthSessionWrapper}
        results in an L{UnauthorizedResource} when the request has an
        I{Authorization} header with a user which does not exist.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_httpauth.py