'Test the backend when email address is supplied'

def test_with_email(self):

    invalid_data_dicts = [{'identification': 'john@example.com', 'password': 'inhalefish'}, {'identification': 'alice@example.com', 'password': 'blowfish'}]
    for invalid_dict in invalid_data_dicts:
        result = self.backend.authenticate(identification=invalid_dict['identification'], password=invalid_dict['password'])
        self.assertFalse(isinstance(result, User))
    result = self.backend.authenticate(identification='john@example.com', password='blowfish')
    self.assertTrue(isinstance(result, User))
