Microsoft.WindowsAzure.MediaServices.Client.Tests.AssetFilterTests.CRUDAssetFilter C# (CSharp) Method

        public void CRUDAssetFilter()
        {
            string assetName = "CRUDAssetFilter_" + Guid.NewGuid().ToString();
            var asset = _mediaContext.Assets.Create(assetName,AssetCreationOptions.None);
            Assert.IsNotNull(asset);

            string filterName = "CRUDAssetFilter_" + Guid.NewGuid().ToString();
            IStreamingAssetFilter filter = asset.AssetFilters.Create(filterName, new PresentationTimeRange(), new List<FilterTrackSelectStatement>());
            Assert.IsNotNull(filter);
            Assert.IsNotNull(filter.ParentAssetId);
            Assert.AreEqual(asset.Id,filter.ParentAssetId);

            asset = _mediaContext.Assets.Where(c => c.Id == asset.Id).FirstOrDefault();
            Assert.IsNotNull(asset);
            Assert.AreEqual(1, asset.AssetFilters.Count());

            //Why we are througing internal server exception here
            filter.PresentationTimeRange = new PresentationTimeRange(timescale: 500);
            filter.Update();

            asset = _mediaContext.Assets.Where(c => c.Id == asset.Id).FirstOrDefault();
            Assert.IsNotNull(asset);
            var filterUpdated = asset.AssetFilters.FirstOrDefault();
            Assert.IsNotNull(filterUpdated);

            Assert.AreEqual(filter.PresentationTimeRange.Timescale, filterUpdated.PresentationTimeRange.Timescale);
            Assert.AreEqual((ulong)500, filterUpdated.PresentationTimeRange.Timescale);

            //We don't have acess to asset filters here
            var globalFilter = _mediaContext.Filters.Where(c => c.Name == filterName).FirstOrDefault();
            Assert.IsNull(globalFilter);

            //Why we are failing here
            filter.Delete();

            asset = _mediaContext.Assets.Where(c => c.Id == asset.Id).FirstOrDefault();
            Assert.IsNotNull(asset);
            Assert.AreEqual(0,asset.AssetFilters.Count());

            globalFilter = _mediaContext.Filters.Where(c => c.Name == filterName).FirstOrDefault();
            Assert.IsNull(globalFilter);
        }