public void GetByCategoryId_ShouldReturnCorrectAd()
{
System.Guid guid = new Guid("911b3163-0401-49e8-8589-68b86153bb68"); //category1
var response = controller.GetByCategoryId(guid);
Assert.AreEqual(HttpStatusCode.OK, response.StatusCode);
var ad = response.Content.ReadAsAsync <IEnumerable <Ad> >().Result;
Assert.AreEqual(ads.Where(c => c.Value.CategoryId == guid).Count(), ad.Count());
}
