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.NET 7 - The type initializer for 'NUnit.Engine.Services.RuntimeFrameworkService' threw an exception

After installing .NET 7 on my development machine, the NUnit tests for some of my projects started to fail.

A look at the test logs showed the following error message:

========== Starting test discovery ==========

NUnit Adapter 4.2.0.0: Test discovery starting

Exception System.TypeInitializationException, Exception thrown discovering tests in C:\Users\bawu\source\repos\NationalRegisterNumber\NationalRegisterNumberTests\bin\Debug\net48\NationalRegisterNumber.UnitTests.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 88

   at NUnit.VisualStudio.TestAdapter.NUnit3TestDiscoverer.DiscoverTests(IEnumerable`1 sources, IDiscoveryContext discoveryContext, IMessageLogger messageLogger, ITestCaseDiscoverySink discoverySink) in D:\repos\NUnit\nunit3-vs-adapter\src\NUnitTestAdapter\NUnit3TestDiscoverer.cs:line 82

InnerException: System.ArgumentException: Unknown framework version 7.0

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()

NUnit Adapter 4.2.0.0: Test discovery complete

As you can see in the message above the NUnit Test Adapter doesn’t like to have .NET 7 available on my machine. This is of course a bug as the application was not even using .NET 7 (it was a .NET 4.8 application to be exact).

Luckily this was noticed by the NUnit team and they provided a fix with a 4.3 release of the NUnit Test adapter.

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