Should source-built .NET SDK include testhost.exe by default

[MichaelSimons]

Discussed in #4095

^{Originally posted by xgqt February 6, 2024}
Hello!

One of Gentoo users has run onto the issue where our build on .NET SDK did not include the testhost.exe file.
https://bugs.gentoo.org/923832

I have some questions that might help us sort it out:

• Is this a expected behavior that should happen with default build?
• Is this file available only when mono build is requested?
• What is the setup of environment and flags to build it while building .NET SDK?

[MichaelSimons]

[Triage] This needs some investigation to gain an understanding of what is happening, if this can be supported by SB or by the end user scenario pulling in MSFT built assets. This is lower priority now with the Unified Build project.

[corngood]

I'm hitting this when building jackett from nixpkgs using the source-built dotnet 8 sdk.

Microsoft (R) Test Execution Command Line Tool Version 17.8.0 (x64)
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
Testhost process for source(s) '/build/source/src/Jackett.Test/bin/Release/net462/linux-x64/Jackett.Test.dll' exited with error: Cannot open assembly '/nix/store/n4b0kjcryx7bs7vnsk7z69b07hgg177y-dotnet-sdk-8.0.111/share/dotnet/sdk/8.0.111/Extensions/../TestHostNetFramework/testhost.exe': No such file or directory.
. Please check the diagnostic logs for more information.