def test_invalid_auth_header(self):
        url = ('/oauth/token?grant_type=client_credentials'
               '&scope=email+address')
        rv = self.client.get(url, headers={
            'Authorization': 'Basic foobar'
        })
        assert b'invalid_client' not in rv.data
dataset/ETHPy150Open lepture/flask-oauthlib/tests/oauth2/test_oauth2.py/TestCredentialAuth.test_invalid_auth_header/operator `in` -> `not in`