Mock .WithSnapshot(string snapshot) using Moq-framework

Library name and version

Azure.Storage.Blobs 12.14.1

Query/Question

Hi,

Is there a possibility to mock (using Moq framework) the .WithSnapshot() method on the BlobClient? Currently the .WithSnapshot() method is not defined as virtual so Moq cannot create an “override” for this specific method. Calls like DeleteAsync() or UploadAsync() can be mocked without any problem.

In my testing code:

_blobClientMock = new Mock<BlobClient>(MockBehavior.Strict);
_blobClientSnapshotMock = new Mock<BlobClient>(MockBehavior.Strict);
_blobClientMock.Setup(x => x.WithSnapshot(mockedBlobItemSnapShot1.Name)).Returns(_blobClientSnapshotMock.Object);

Error when I debug / run the test:

System.NotSupportedException : Unsupported expression: x => x.WithSnapshot(mockedBlobItemSnapShot1.Name)
Non-overridable members (here: BlobClient.WithSnapshot) may not be used in setup / verification expressions.

I know we can do it the “hard” way by wrapping things etc. but I was wondering if we could avoid this and if there are any other solutions to do this.

Thanks in advance,

Tom

Environment

Azure Functions Runtime 4 and .NET6.0 Microsoft Visual Studio Enterprise 2022 (64-bit) - Preview Version 17.7.0 Preview 1.0

[jsquire]

@jsquire Any news on this subject? 😄

Unfortunately, I do not have insight - my role was just to triage. @PramodValavala-MSFT: can you provide an update?

[amnguye]

Let me look into this. I’m trying to figure out why the inherited class on the BlobBaseClient.WithSnapshot isn’t being used over the BlobClient.WithSnapshot since they are both essentially the same thing, but the API looks a little different.

Sorry for the inconvenience. If possible I think you can still use the BlobBaseClient.WithSnapshot instead since that one is virtual, as a mitigation for now.