Migrating to xunit.v3 and to Microsoft.Testing.Platform

[Youssef1313]

@danmoseley @joperezr I'm opening this issue per our internal discussion.

Basically I want to discuss moving from xunit v2 to xunit.v3 as a first step, then afterwards, move from VSTest to the newer platform, Microsoft.Testing.Platform.

Moving from v2 to v3 will probably need some changes on Arcade side, so that attributes like ActiveIssue etc are still supported without any extra work to be done on Aspire side.

I'm anticipating that the move to v3 will need to happen in future anyways.

A future move to MTP will also mean that custom test loggers that are written against VSTest will not work. Currently, the only custom logger used is GitHubActionsTestLogger. Trx is for sure supported with MTP via Microsoft.Testing.Extensions.TrxReport.

cc @davidfowl

[danmoseley]

There'll certainly be some .NET team that wants to move to v3 so if you want you can do the Arcade changes now without waiting for a decision here.

I'm guessing we don't have any particular reason to move to v3 any time soon in Aspire, but I'm also guessing your offer to do the migration has an expiry time which might be a reason to do it.

[joperezr]

Agree with everything shared by Dan, the only thing I'm interested in also learning would be in the move to MTP. Can you share a bit more details on what would this entail and perhaps also some of the pros and cons of such move?