Add support for testing unpackaged WinUI applications

[Evangelink]

Results of my investigations on the WinUI issue #1127 (comment) are showing that we now work correctly for all cases but unpackaged applications. Although, this is not a work related to MSTest, I want to keep track of this missing feature.

AB#2050311

[michael-hawker]

Thanks @Evangelink, is there an issue tracking this in the WinAppSDK repo we can link to?

Also, copying your matrix here and formatting as a table:

WindowsAppSDKSelfContained	Not set			True			False
WindowsPackageType	Not set	None	MSIX	Not set	None	MSIX	Not set	None	MSIX
Result with VSTest	✅	❌	✅	✅	❌	✅	✅	❌	✅

And the resulting error for the None WindowsPackageType:

File name: 'C:\src\temp\MSTestWinUI\UnitTest\bin\x64\Debug\net6.0-windows10.0.19041.0\win10-x64\AppxManifest.xml'
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize)
   at System.Xml.XmlDownloadManager.GetStream(Uri uri, ICredentials credentials, IWebProxy proxy, RequestCachePolicy cachePolicy)
   at System.Xml.XmlUrlResolver.GetEntity(Uri absoluteUri, String role, Type ofObjectToReturn)
   at System.Xml.XmlTextReaderImpl.FinishInitUriString()
   at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
   at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options)
   at Microsoft.VisualStudio.UwpTestHostRuntimeProvider.AppxManifestFile.ReadTargetPlatformVersions()
   at Microsoft.VisualStudio.UwpTestHostRuntimeProvider.AppxManifestFile.get_TargetPlatformVersion()
   at Microsoft.VisualStudio.UwpTestHostRuntimeProvider.Deployer.Microsoft.VisualStudio.UwpTestHostRuntimeProvider.IDeployer.get_TargetPlatformVersion()
   at Microsoft.VisualStudio.UwpTestHostRuntimeProvider.UwpTestHostManager.<LaunchHostAsync>d__36.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.UwpTestHostRuntimeProvider.UwpTestHostManager.<Microsoft-VisualStudio-TestPlatform-ObjectModel-Host-ITestRuntimeProvider-LaunchTestHostAsync>d__28.MoveNext()<---

[Evangelink]

Thanks @Evangelink, is there an issue tracking this in the WinAppSDK repo we can link to?

Not yet. I am still discussing some details but I will post here the ticket or info once it's sorted.

[testplatform-bot]

✅ Successfully linked to Azure Boards work item(s):

• User Story 2050311

[Evangelink]

Postponing to next iteration as there were many bug fixes to handle this sprint.

[Evangelink]

Postponing to wait for availability from WinUI team.