public async Task AppendBlobReadStreamSeekTestAsync()
        {
            byte[]             buffer    = GetRandomBuffer(3 * 1024 * 1024);
            CloudBlobContainer container = GetRandomContainerReference();

            try
            {
                await container.CreateAsync();

                CloudAppendBlob blob = container.GetAppendBlobReference("blob1");
                await blob.CreateOrReplaceAsync();

                blob.StreamMinimumReadSizeInBytes = 2 * 1024 * 1024;
                using (MemoryStream wholeBlob = new MemoryStream(buffer))
                {
                    await blob.AppendBlockAsync(wholeBlob);
                }

                OperationContext opContext = new OperationContext();
                using (var blobStream = await blob.OpenReadAsync(null, null, opContext))
                {
#if WINDOWS_RT
                    int attempts = await BlobReadStreamSeekTestAsync(blobStream.AsRandomAccessStream(), blob.StreamMinimumReadSizeInBytes, buffer);
#else
                    int attempts = await BlobReadStreamSeekTestAsync(blobStream, blob.StreamMinimumReadSizeInBytes, buffer);
#endif
                    TestHelper.AssertNAttempts(opContext, attempts);
                }
            }
            finally
            {
                container.DeleteIfExistsAsync().Wait();
            }
        }
        public async Task AppendBlobReadStreamBasicTestAsync()
        {
            byte[]             buffer    = GetRandomBuffer(4 * 1024 * 1024);
            CloudBlobContainer container = GetRandomContainerReference();

            try
            {
                await container.CreateAsync();

                CloudAppendBlob blob = container.GetAppendBlobReference("blob1");
                await blob.CreateOrReplaceAsync();

                using (MemoryStream wholeBlob = new MemoryStream(buffer))
                {
                    await blob.AppendBlockAsync(wholeBlob);
                }

                using (MemoryStream wholeBlob = new MemoryStream(buffer))
                {
                    using (Stream blobStream = (await blob.OpenReadAsync()))
                    {
                        TestHelper.AssertStreamsAreEqual(wholeBlob, blobStream);
                    }
                }
            }
            finally
            {
                container.DeleteIfExistsAsync().Wait();
            }
        }
        public async Task AppendBlobReadLockToETagTestAsync()
        {
            byte[]             outBuffer = new byte[1 * 1024 * 1024];
            byte[]             buffer    = GetRandomBuffer(2 * outBuffer.Length);
            CloudBlobContainer container = GetRandomContainerReference();

            try
            {
                await container.CreateAsync();

                CloudAppendBlob blob = container.GetAppendBlobReference("blob1");
                await blob.CreateOrReplaceAsync();

                blob.StreamMinimumReadSizeInBytes = outBuffer.Length;
                using (MemoryStream wholeBlob = new MemoryStream(buffer))
                {
                    await blob.AppendBlockAsync(wholeBlob);
                }

                OperationContext opContext = new OperationContext();
                using (var blobStream = await blob.OpenReadAsync(null, null, opContext))
                {
                    Stream blobStreamForRead = blobStream;
                    await blobStreamForRead.ReadAsync(outBuffer, 0, outBuffer.Length);

                    await blob.SetMetadataAsync();

                    await TestHelper.ExpectedExceptionAsync(
                        async() => await blobStreamForRead.ReadAsync(outBuffer, 0, outBuffer.Length),
                        opContext,
                        "Blob read stream should fail if blob is modified during read",
                        HttpStatusCode.PreconditionFailed);
                }

                opContext = new OperationContext();
                using (var blobStream = await blob.OpenReadAsync(null, null, opContext))
                {
                    Stream blobStreamForRead = blobStream;
                    long   length            = blobStreamForRead.Length;
                    await blob.SetMetadataAsync();

                    await TestHelper.ExpectedExceptionAsync(
                        async() => await blobStreamForRead.ReadAsync(outBuffer, 0, outBuffer.Length),
                        opContext,
                        "Blob read stream should fail if blob is modified during read",
                        HttpStatusCode.PreconditionFailed);
                }

                opContext = new OperationContext();
                AccessCondition accessCondition = AccessCondition.GenerateIfNotModifiedSinceCondition(DateTimeOffset.Now.Subtract(TimeSpan.FromHours(1)));
                await blob.SetMetadataAsync();

                await TestHelper.ExpectedExceptionAsync(
                    async() => await blob.OpenReadAsync(accessCondition, null, opContext),
                    opContext,
                    "Blob read stream should fail if blob is modified during read",
                    HttpStatusCode.PreconditionFailed);
            }
            finally
            {
                container.DeleteIfExistsAsync().Wait();
            }
        }