Mocking redis in python

I am trying to mock redis to enable testing of my python app which is built in Django. All of my instances of redis come from a module named record, with the init.py file containing:

redis_client = redis.from_url(os.environ.get("REDIS_URL"))

I tried to patch the instance with mockredis, but it is not working. Here is mode code:

class TestReleaseDashboard(TestCase):
    def setUp(self):

        # patch redis
        redis_patcher = patch('record.redis_client', mock_redis_client())
        self.redis = redis_patcher.start()
        self.addCleanup(redis_patcher.stop)

        # add data
        self.redis.set('LATEST_UPDATE', 'Fall 2012')
        self.redis.set('NEXT_UPDATE', 'Spring 2013')

    def test_can_filter_pensions(self):
        print(redis_client)
        print(self.redis)

The result of those two print statements is:

Redis<ConnectionPool<Connection<host=localhost,port=6379,db=0>>>
<mockredis.client.MockRedis object at 0x1132924d0>

What can I do to fix this and mock the instance?