Project not building with Stryker

[AshleighAdams]

Describe the bug When running locally, Stryker builds and tests things fine (Windows), but on GitHub Actions, a compile error is generated. In particular, it looks to be related with a standard2.0 compatibility library for adding nullable annotations (https://github.com/manuelroemer/Nullable)

Logs

[21:32:08 WRN] Stryker.NET encountered an compile error in /home/runner/work/Verlite/Verlite/src/Verlite.Core/SemVer.cs (at 80:45) with message: The type or namespace name 'NotNullWhenAttribute' could not be found (are you missing a using directive or an assembly reference?) (Source code: NotNullWhen)

Stryker log is attached.

Expected behavior Mutation testing to complete sucessfully as it does when running locally on my Windows machine.

Desktop (please complete the following information):

• OS: Linux
• Type of project: standard 2.0
• Framework version: dotnet 6 or 7
• Stryker version: 3.2.0

Additional context The exact project setup can be found here: https://github.com/AshleighAdams/Verlite/actions/runs/3596938533/jobs/6058181386

Additionally, this bug looks to be related: https://github.com/manuelroemer/Nullable/issues/24 StrykerOutput.zip

[rouke-broersma]

Linked issues seem to suggest this is related to ContentFiles, and is fixed in a newer version of Nullable. Do you have this issue with the latest version?

[AshleighAdams]

Yeah, I did encounter that bug in my other CI/CD parts, and updating did fix those parts.

[rouke-broersma]

So this problem is fixed?

[AshleighAdams]

Nope, sorry, I was experiencing the linked bug where it wasn't building until I updated to the fixed version. The fixed version that now otherwise builds fails with Stryker.

[rouke-broersma]

We probably don't search ContentFiles for source code.

[Liam-Rougoor]

@AshleighAdams I've been looking into it a little, it seems that if you run the action on Windows instead of Linux, this error/issue does not occur (just like how it works on your local Windows machine). I have not yet found the cause of this issue, but this could be a temporary workaround for you.

[AshleighAdams]

Thanks, that workaround works for me :)

[FrediKats]

Faced with the same problem. CI doesn't work on Ubuntu and works on Windows. PR with confirm attached.

[rouke-broersma]

ContentFiles should now be supported