static MockRequestHelper() { MemoryStream ms = new MemoryStream(); using (FileStream fs = File.OpenRead("samplepayload.json")) { fs.CopyTo(ms); MockRequestHelper.testItemResponsePayload = ms.ToArray(); } ms = new MemoryStream(); using (FileStream fs = File.OpenRead("samplefeedpayload.json")) { fs.CopyTo(ms); MockRequestHelper.testItemFeedResponsePayload = ms.ToArray(); } List <TransactionalBatchOperationResult> results = new List <TransactionalBatchOperationResult> { new TransactionalBatchOperationResult(System.Net.HttpStatusCode.OK) { ResourceStream = new MemoryStream(MockRequestHelper.testItemFeedResponsePayload, 0, MockRequestHelper.testItemFeedResponsePayload.Length, writable: false, publiclyVisible: true), ETag = Guid.NewGuid().ToString() } }; batchResponsePayloadWriter = new BatchResponsePayloadWriter(results); batchResponsePayloadWriter.PrepareAsync().GetAwaiter().GetResult(); }