Use generic math in System.Numerics.Vectors test utils

[akoeplinger]

See #60335 (comment), it could simplify the code a lot.

Tagging subscribers to this area: @dotnet/area-system-numerics
See info in area-owners.md if you want to be subscribed.

Issue Details

---

See #60335 (comment), it could simplify the code a lot.

Author:	akoeplinger
Assignees:	-
Labels:	area-System.Numerics, up-for-grabs, untriaged
Milestone:	Future

[SkiFoD]

@akoeplinger Hi, I would like to work on the issue and I have already done some research. I have trouble with adding the System.Runtime.Experimental reference to the project so I could use the generic math. Could you give me a hint how to do that the right way?

[tannergooding]

@SkiFoD, you should just need to add a reference to the System.Runtime.Experimental reference assembly, like so

    <!-- it's a reference assembly, but the project system doesn't know that - include it during compilation, but don't publish it -->
    <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime.Experimental\ref\System.Runtime.Experimental.csproj" IncludeAssets="compile" Private="false" />

This is how its handle in the corresponding test project for System.Runtime.Experimental: https://github.com/dotnet/runtime/blob/main/src/libraries/System.Runtime.Experimental/tests/System.Runtime.Experimental.Tests.csproj#L51-L52

[SkiFoD]

@tannergooding Thank you! I have some more questions. Is it ok to wrap the Util.cs with pragmas that disables CA2252 or is there a better way to get rid of the warnings?

[tannergooding]

You'll need to annotate the type with RequiresPreviewFeatures attribute, much as was already done for https://github.com/dotnet/runtime/blob/main/src/libraries/System.Runtime/tests/System/GenericMathHelpers.cs

These will go away once we start stabilizing the feature and confirm it will no longer be preview in the corresponding .NET release.