[Bug] There are no example NUnit or MSTest projects for testing Maui libraries using VS 2022 preview 4

[Zachael]

Prior to the introduction of workloads, it was possible to write NUnit projects for a Maui library. The project created virtual controls within a Windows executable without creating the native controls.

With VS 2022 preview 4, the project gives the error:
The framework 'Microsoft.Maui.Core', version 'FromWorkload' (x64) was not found.

It was also possible to write MSTest unit tests that launched the unit tests as a MSIX application using the the following code in App.xaml.cs (using MSTest.TestFramework, MSTest.TestAdapter, Microsoft.TestPlatform.TestHost and coverlet.collector).

protected override void OnLaunched(LaunchActivatedEventArgs args)
{
     base.OnLaunched(args);

     Microsoft.Maui.Essentials.Platform.OnLaunched(args);

     Microsoft.VisualStudio.TestPlatform.TestExecutor.UnitTestClient.CreateDefaultUI();

     UITestMethodAttribute.DispatcherQueue = MainWindow.DispatcherQueue;

     Microsoft.VisualStudio.TestPlatform.TestExecutor.UnitTestClient.Run(Environment.CommandLine);
}

With VS2022 preview 4, the MSTest project gives the error:
error CS7069: Reference to type 'DispatcherQueue' claims it is defined in 'Microsoft.WinUI', but it could not be found

What is the guidance for writing unit tests which can be run within VS for testing Maui libraries for Windows?

[Eilon]

Dup of #2112