Default .NET Template UITest Fails to Run Test

[SkyeHoefling]

Current behavior

When creating a new project using the .NET CLI dotnet new unoapp-extensions the UI Tests will not work out of the box. This is because the NUnit3TestAdapter has a known issue in 4.2.1 where it will always have an exception when running the tests

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.NUnit3TestExecutor.RunAssembly(String assemblyPath, IGrouping`2 testCases, TestFilter filter) in D:\repos\NUnit\nunit3-vs-adapter\src\NUnitTestAdapter\NUnit3TestExecutor.cs:line 275
InnerException: System.ArgumentException: Unknown framework version 7.0

This issue is fully documented with a workaround nunit/nunit3-vs-adapter#987

Expected behavior

When right-click on the UITest project it should run the tests correctly

How to reproduce it (as minimally and precisely as possible)

ReproductionProject.zip

1. Download the reproduction project or generate a fresh project using dotnet new unoapp-extensions using version 2.1.1
2. Open with Visual Studio
3. Launch the WASM project without debugging by setting as startup and tapping ctrl + F5
4. Open the Visual Studio Text Explorer
5. Run UI Tests

Environment

Nuget Package: Uno.Extensions.Templates

Package Version(s): 2.1.1

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renders for Xamarin.Forms
• Windows
• Build tasks

Visual Studio:

• 2017 (version: )
• 2019 (version: )
• 2022 (version: 17.2.5)
• for Mac (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

I was able to follow the NUnit VS Adapter discussion in nunit/nunit3-vs-adapter#987 and update the test adapter to a preview build. Looks like it is the recommended approach as .NET 7 gets closer to GA. See exact comment nunit/nunit3-vs-adapter#987 (comment)

PR is incoming

[nickrandolph]

I don't think the issue is with the test adapter, there's a line of code missing in the template to instruct the UITests to not run in headless mode in debug.
Fixed here:

uno.extensions/src/Uno.Extensions.Templates/content/unoapp-extensions/MyExtensionsApp.UITests/TestBase.cs

Lines 18 to 20 in 11efd7d

	#if DEBUG
	AppInitializer.TestEnvironment.WebAssemblyHeadless = false;
	#endif