How to use Redis in unit testing?

Suppose I have a method in my controller class that updates the score of a key,value pair in a Redis database. I want to write a unit test to check if the score is not null and is incremented by 1. I just want to see how unit testing works with Redis and how you extract the score from a particular key, value pair and check its validity.

Controller Class //When user refreshes api/do/v1/togglelike/{id}", the score is updated in redis for that user and is incremented by 1;

[HttpGet]
        [Route("api/do/v1/togglelike/{id}")]
        public IHttpActionResult ToggleLike(String id)
        {
            var currentUser = "mike";


            var likeSet = redis1.SortedSetRangeByScore("likes:" + id);
            var likeStatus = redis1.SortedSetScore("likes:" + id, currentUser);

            //Current user has not yet liked the profile
            if (likeStatus == null)
            {
                redis1.SortedSetAdd("likes:" + id, currentUser, 1);
                return Ok("Like Added");

            }
            /*redis1.SortedSetAdd("likes:" + id, currentUser, 1);
            return Ok("Like Added");*/
            else
            {
                double counter = redis1.SortedSetIncrement("likes:" + id, currentUser, 1);
                 redis1.SortedSetAdd("likes:" + id, currentUser, counter);
                 return Ok("Like Added");
                /*redis1.SortedSetRemove("likes:" + id, currentUser);
                return Ok("Like Removed");*/
            }
        }

Test Class: I want to get the score from the key,value pair and check that it is equal to a valid number;

namespace VideoControllerTest
{
    [TestClass]
    public class VideoControllerTest
    {
         IDatabase redis1;

        public VideoControllerTest()
        {
            redis1 = RedisFactory.Connection.GetDatabase();
        }

        [TestMethod]
        public void VideoController_Adview()
        {
            //Arrange
            VideoController controller = new VideoController();
            //Act
            IHttpActionResult actionResult = controller.ToggleLike("video123");

            //Assert; Check to see the counter is incremented by 1 and is not null;

        }
    }
}