Migrate from MSTest to xunit

[akoeplinger]

MSTest isn't available cross-platform and the other dotnet open source projects like corefx migrated to xunit already.

[AndyGerlicher]

Our cross platform branch already has them in nunit so they work on other platforms. Xunit is probably a better choice though since corefx/coreclr is using that.

Either way that branch should be posted within a week or so.

[akoeplinger]

Great! Yeah I think it'd be good to use the same testing frameworks as the .NET Core repos.

[mmitche]

+1 to using the same harness please.

[olivierrr]

👍

[NotMyself]

[Maxwe11]

Which xunit should be installed (from nuget.org or dotnetbuild-tools on myget.org) ?
What else should be done except changes in code?

[mmitche]

@Maxwe11 You should use the one on dotnet-buildtools, which is being updated as necessary to work well with CoreCLR

[mmitche]

Add to this that the tests should be runnable from the command line.

@AndyGerlicher We probably need to make the tests runnable from the command line (or directly from the build) to make them useful in CI. Can we move msbuild to xunit (also has VS integration) and integrate the tests into the command line build (like corefx) asap? Can that change be merged into master?

[AndyGerlicher]

Yes @mmitche that is definitely a change we would want to take (and merged into master). Just not the highest priority right now (focusing on getting corefx to build on Linux/Mac).

[AndyGerlicher]

Ideally this should be done in master.