MSTest v2 won't run with net5.0-windows

Question

I am trying to create a MSTest project for unit testing of our WinUI 3 development. I am able to run tests through the test explorer when targeting .NET 5.0.

Project Reunion requires net5.0-windows10.0.19041 as the target framework. When I try to run tests targeting net5.0-windows10.0.19041 the project builds but the tests do not run. The output of the Test log below says the WinUI3-UnitTests.dll file is not found but WinUI3-UnitTests.dll does exist in the specified location.

[2021-10-05 9:38:57.350 AM] [MSTest][Discovery][WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\WinUI3-UnitTests.dll] Failed to discover tests from assembly WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\WinUI3-UnitTests.dll. Reason:File does not exist: WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\WinUI3-UnitTests.dll

In the MSTest output log it throws a System.InvalidOperation exception

TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.725, 12341249999384, testhost.x86.dll, AssemblyResolver.OnResolve: Resolved assembly: Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices, from path: \WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.dll
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.725, 12341250002103, testhost.x86.dll, MSTestExecutor.RunTests: Running tests from sources.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.728, 12341250024421, testhost.x86.dll, CollectSourceInformation value Found : False 
TpTrace Error: 0 : 4580, 4, 2021/10/01, 16:05:24.773, 12341250480636, testhost.x86.dll, Exception of type 'System.InvalidOperationException' was thrown.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.774, 12341250491724, testhost.x86.dll, AssemblyResolver.OnResolve: Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources: Resolving assembly.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.774, 12341250492593, testhost.x86.dll, AssemblyResolver.OnResolve: Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources: Searching in: 'WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041'.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.774, 12341250493693, testhost.x86.dll, AssemblyResolver.OnResolve: Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources: Assembly path does not exist: 'WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources.dll', returning.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.775, 12341250494624, testhost.x86.dll, AssemblyResolver.OnResolve: Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources: Assembly path does not exist: 'WinUI3-Demo\WinUI3-UnitTests\bin\Debug\net5.0-windows10.0.19041\Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources.exe', returning.
TpTrace Information: 0 : 4580, 4, 2021/10/01, 16:05:24.775, 12341250495194, testhost.x86.dll, AssemblyResolver.OnResolve: Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.resources: Failed to load assembly.

My Nuget packages for reference

    <PackageReference Include="Microsoft.Graphics.Win2D" Version="1.0.0.26-experimental1" />
    <PackageReference Include="Microsoft.ProjectReunion" Version="0.8.4" />
    <PackageReference Include="Microsoft.ProjectReunion.Foundation" Version="0.8.4" />
    <PackageReference Include="Vortice.WinUI" Version="2.0.20-beta" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
    <PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
    <PackageReference Include="MSTest.TestFramework" Version="2.2.7" />

Peter Csala · Accepted Answer · 2021-10-05 14:40:14Z

3

Resolved by reverting MSTest.TestAdapter and MSTest.TestFramework back to version 2.2.3.

edited Oct 5, 2021 at 14:40

Peter Csala

23.7k16 gold badges51 silver badges96 bronze badges

answered Oct 5, 2021 at 14:34

JJenkins

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2 Comments

Xingyu Zhao Over a year ago

It seems that your problem has been solved, so please consider accepting it.

Rye bread Over a year ago

I have the same problem with net6.0-windows10.0.19041 instead of net5.0-windows10.0.19041. Downgrading the version 'solved' my problem too.

Rye bread · Accepted Answer · 2022-08-30 08:06:51Z

1

I had the same problem with net6.0-windows10.0.19041 instead of net5.0-windows10.0.19041. (VS 2022)

Upgrading the 3 Nuget packages (Microsoft.NET.Test.Sdk, MSTest.TestAdapter, MSTest.TestFramework) in the test project to the latest versions solved it.

edited Aug 30, 2022 at 8:06

answered Aug 29, 2022 at 13:46

Rye bread

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1 Comment

Grault Over a year ago

I initially thought I continued having the problem, but my Output was telling me to change my test methods and I may never have had this problem in the first place. Check your Output!

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