async def METHOD_NAME(self):
    """
    test the auxiliary method to add a user to the mocked redis db, both using the old and the new hashing
    """
    await self.mock_redis_plugin.add_user(2, 'mary', 'maryspassword',
                                          'Mary', 'White', 'mary.white@localhost')
    await self.mock_redis_plugin.add_user_old_hashing(
        3, 'ann', 'annspassword', 'Ann', 'Rose', 'ann.rose@localhost')
    self.assertEqual('user:2', await self.mock_redis_plugin.hash_get('user_index', 'mary'))
    self.assertEqual('mary', (await self.mock_redis_plugin.get('user:2')).get('username'))
    self.assertEqual('user:3', await self.mock_redis_plugin.hash_get('user_index', 'ann'))
    self.assertEqual('ann', (await self.mock_redis_plugin.get('user:3')).get('username'))