MSTestRunner does not integrate with "VS MSBuild"

[RuiAlias]

Describe the bug

An MSTest.Sdk project cannot be tested with "VS MSBuild" (or "Full MSBuild").

Steps To Reproduce

On a Windows machine with "VS MSBuild" and dotnet SDK installed:

dotnet new mstest
MSBuild.exe -restore -t:Build;Test mstest.csproj

You can also see the repro: https://github.com/RuiAlias/mtp-msbuild-repro. On this repro I created a GitHub Actions Workflow that runs the msbuild command and fails: https://github.com/RuiAlias/mtp-msbuild-repro/actions/runs/11858511987/job/33049304509.

Expected behavior

MSBuild.exe runs the tests successfully.

Actual behavior

MSBuild.exe fails with error:

D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed: Tests failed: Possible reasons for this include: [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]
D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed: Could not execute because the specified command or file was not found. [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]
D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed:   * You misspelled a built-in dotnet command. [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]
D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed:   * You intended to execute a .NET program, but dotnet---internal-msbuild-node does not exist. [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]
D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed:   * You intended to run a global tool, but a dotnet-prefixed executable with this name could not be found on the PATH. [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]
D:\a\mtp-msbuild-repro\mtp-msbuild-repro\bin\Debug\net8.0\mtp-msbuild-repro.dll : error run failed:  [D:\a\mtp-msbuild-repro\mtp-msbuild-repro\mtp-msbuild-repro.csproj]

Additional context

I think I've narrowed the problem down to the name of the executable "MSBuild.exe".

testfx/src/Platform/Microsoft.Testing.Platform.MSBuild/Tasks/InvokeTestingPlatformTask.cs

Line 191 in 7eade67

if (dotnetRunnerName != MonoRunnerName && Path.GetFileName(_currentProcess.MainModule!.FileName!).Equals(dotnetRunnerName, StringComparison.OrdinalIgnoreCase))

On the repro there is a GitHub Action Workflow that proves this by: renaming the executable from "MSBuild.exe" to "dotnet.exe" and then running dotnet.exe -restore -t:Build;Test mstest.csproj, the tests run successfully.

• dotnet test mstest.csproj works
• dotnet msbuild -restore -t:Build;Test mstest.csproj works
• MSBuild.exe -restore -t:Build;Test mstest.csproj fails
• mv MSBuild.exe dotnet.exe; dotnet.exe -restore -t:Build;Test mstest.csproj works

https://github.com/RuiAlias/mtp-msbuild-repro/blob/main/.github/workflows/build-and-test.yml