public void GetByAdId_ShouldReturnCorrectRating()
        {
            Guid guid     = new Guid("ee4cd8a2-eb0e-453d-a3b5-081b9165942e");
            var  response = controller.GetByAdId(guid);

            Assert.IsNotNull(response);
            Assert.AreEqual(HttpStatusCode.OK, response.StatusCode);
            var rating = response.Content.ReadAsAsync <IEnumerable <Rating> >().Result;

            Assert.AreEqual(ratings.Where(c => c.Value.AdId == guid).Count(), rating.Count());
        }