SPFeature testing

        public static void ActivateWebFeature(SPWeb web, Guid featureId)
        {
            if (web.Features[featureId] == null) // check if the feature is enabled
            {
                web.Features.Add(featureId, true);
                web.Update();
            }
        }

            
            Guid featureId = Guid.NewGuid();
            var feature = Isolate.Fake.Instance<SPFeature>(Members.ReturnRecursiveFakes);
            Isolate.WhenCalled(() => web.Features[featureId]).WillReturn(feature);