It may be valuable to use CoreFX tests to validate your changes to CoreCLR or mscorlib.
In order to do this you need to create a file called localpublish.props
under the <repo root>\packages
folder.
The contents of the file should look like this (make sure to update the version to the current version of the CoreCLR package used by CoreFx):
<Project ToolsVersion="12.0" DefaultTargets="Build"
xmlns="http://schemas.microsoft.com/developer/msbuilding/2003">
<ItemGroup>
<LocalPackages Include="$(PackagesBinDir)">
<PackageName>Microsoft.DotNet.CoreCLR</PackageName>
<PackageVersion>1.0.2-prerelease</PackageVersion>
<InstallLocation><corefx repo root>\packages</InstallLocation>
</LocalPackages>
</ItemGroup>
</Project>
Once this file is there, subsequent builds of the CoreCLR repo will install the CoreCLR package into the location specified by InstallLocation
.
To run tests, follow the procedure for running tests in CoreFX.