.Net Framework tests fails when .Net 8 is present on system

I have a project that targets both .Net 7 and .Net Framework 4.7.2.

I installed the .Net 8 alpha for an unrelated purpose, and unit tests for .Net Framework will no longer run.

Using: NUnit 3.13.3 NUnit3TestAdapter 4.3.1 .Net 7.0.102 and .Net Framework 4.7.2

Projects global.json:

{
	"sdk": {
		"allowPrerelease": false,
		"version": "7.0.100",
		"rollForward": "latestMinor"
	}
}

Installed SDKs

PS C:\r\MyProject> dotnet --list-sdks
3.1.426 [C:\Program Files\dotnet\sdk]
6.0.100-rc.2.21505.57 [C:\Program Files\dotnet\sdk]
6.0.103 [C:\Program Files\dotnet\sdk]
6.0.113 [C:\Program Files\dotnet\sdk]
6.0.308 [C:\Program Files\dotnet\sdk]
6.0.405 [C:\Program Files\dotnet\sdk]
7.0.100-rc.2.22477.23 [C:\Program Files\dotnet\sdk]
7.0.101 [C:\Program Files\dotnet\sdk]
7.0.102 [C:\Program Files\dotnet\sdk]
8.0.100-alpha.1.23059.8 [C:\Program Files\dotnet\sdk]

Requested version is correctly used

PS C:\r\MyProject> dotnet --version
7.0.102

NUnit to run with .Net 8 anyway?

PS C:\r\MyProject> dotnet test MyProject\Tests\bin\Tests.dll
Microsoft (R) Test Execution Command Line Tool Version 17.4.0 (x64)
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
Exception System.TypeInitializationException,    Exception thrown executing tests in C:\r\MyProject\Tests\bin\Tests.dll
The type initializer for 'NUnit.Engine.Services.RuntimeFrameworkService' threw an exception.
   at NUnit.Engine.Services.RuntimeFrameworkService.ApplyImageData(TestPackage package)
   at NUnit.Engine.Services.RuntimeFrameworkService.SelectRuntimeFramework(TestPackage package)
   at NUnit.Engine.Runners.MasterTestRunner.GetEngineRunner()
   at NUnit.Engine.Runners.MasterTestRunner.Explore(TestFilter filter)
   at NUnit.VisualStudio.TestAdapter.NUnitEngine.NUnitEngineAdapter.Explore(TestFilter filter) in D:\repos\NUnit\nunit3-vs-adapter\src\NUnitTestAdapter\NUnitEngine\NUnitEngineAdapter.cs:line 97
   at NUnit.VisualStudio.TestAdapter.NUnit3TestExecutor.RunAssembly(String assemblyPath, IGrouping`2 testCases, TestFilter filter) in D:\repos\NUnit\nunit3-vs-adapter\src\NUnitTestAdapter\NUnit3TestExecutor.cs:line 282
InnerException: System.ArgumentException: Unknown framework version 8.0
Parameter name: version
   at NUnit.Engine.RuntimeFramework.GetClrVersionForFramework(Version frameworkVersion)
   at NUnit.Engine.RuntimeFramework..ctor(RuntimeType runtime, Version version, String profile)
   at NUnit.Engine.RuntimeFramework.GetNetCoreRuntimesFromDirectoryNames(IEnumerable`1 dirNames)
   at NUnit.Engine.RuntimeFramework.FindDotNetCoreFrameworks()
   at NUnit.Engine.RuntimeFramework.get_AvailableFrameworks()
   at NUnit.Engine.Services.RuntimeFrameworkService..cctor()
No test is available in C:\r\MyProject\Tests\bin\Tests.dll. Make sure that test discoverer & executors are registered and platform & framework version settings are appropriate and try again.

Additionally, path to test adapters can be specified using /TestAdapterPath command. Example  /TestAdapterPath:<pathToCustomAdapters>.

Expectation: Tests run with the sdk and runtime defined by the project, regardless of which unrelated sdks might be present on the system.

[tkvalvik]

Ran the test suites on a mixed .Net 7 and .Net Framework 4.7.2-project.

“Works on my machine”

[OsirisTerje]

@tkvalvik @madelson Version 4.4.0-beta.1 is out now https://www.nuget.org/packages/NUnit3TestAdapter/4.4.0-beta.1 . It includes support for .net 8. Appreciate it if you have the time to verify it works as it should. Once verification is done, the non-beta will be published.