[NETE2ESDK][Mac][Linux][Regression] With .NET 10.0.100-rc.1.25409.103 Binaries, xunit project tested failed with error MSB6006 if DOTNET_ROOT was not set.

[NicoleWang001]

REGRESSION INFO
Worked well on .NET 10.0.100-rc.1.25409.103
Worked well on .NET 10 Preview 7

REPRO STEPS

1. Clean machine: Mac or Linux distributions
2. Extract the NET 10.0.100-rc.1.25409.103 binary to a custom directory. eg. tar -zxf ../dotnet-sdk-10.0.100-rc.1.25416.112-linux-x64.tar.gz -C ~/mytest
3. Create a xunit project using dotnet from the binary. eg. ~/mytest/dotnet new xunit
4. Running test using using dotnet from the binary. eg. ~/mytest/dotnet test
5. Observe

Expected Behavior
Testing works fine.

Actual Behavior
xunit project tested failed with error MSB6006
Screens on Ubuntu 24.04

Screens on Mac

Note

1. This issue only reproduced with xunit project. It is not reproduced with mstest or nunit project
2. This issue is not reproduced with zip installer on Windows
3. This issue is not reproduced after setting DOTNET_ROOT
   donet --info
   nicole@Ubuntu2404:~$ ~/mytest/dotnet --info
   .NET SDK:
   Version: 10.0.100-rc.1.25416.112
   Commit: 8c49b05924
   Workload version: 10.0.100-manifests.f436f675
   MSBuild version: 17.15.0-preview-25416-112+8c49b0592

Runtime Environment:
OS Name: ubuntu
OS Version: 24.04
OS Platform: Linux
RID: linux-x64
Base Path: /home/nicole/mytest/sdk/10.0.100-rc.1.25416.112/

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:
Version: 10.0.0-rc.1.25416.112
Architecture: x64
Commit: 8c49b05924

.NET SDKs installed:
10.0.100-rc.1.25416.112 [/home/nicole/mytest/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 10.0.0-rc.1.25416.112 [/home/nicole/mytest/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 10.0.0-rc.1.25416.112 [/home/nicole/mytest/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

[nohwnd]

I could see the issue reproduce on my wsl. Same issue has been reported on xunit previously and is showing up now because we've updated the templates to xunit v3 in the latest sdk.

xunit/xunit#3258

We should probably expand the logic in dotnet sdk to set dotnet_root_ for the run, even on linux, and not just on windows. We already do this on windows to be able to start testhost.exe (on other OS we run via dotnet exec testhost.dll).

Users can work around this issue by downgrading xunit.v3 package to xunit 2.9.3 package, or by setting dotnet_root as outlined in the linked issue.

[bradwilson]

This is similar to an issue that was logged when using NixOS due to the fact that, for multi-project runners (like xunit.runner.visualstudio) we depend on the ability to be able to launch xUnit.net v3 test projects, since they are stand alone executables. Anything that would prevent that from functioning will of course break us, which it sounds like is the case here with the lack of DOTNET_ROOT.

[NicoleWang001]

This issue was still reproduced on the latest RC1 candidate build 10.0.100-rc.1.25419.117

[nohwnd]

Tested on the rc1 build that is currently on staging in relese tracker, and it worked. Sent you direct message to confirm.

[NicoleWang001]

@nohwnd Checked it on the latest RC 1 candidate build 10.0.100-rc.1.25422.107 . This issue was fixed.