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RESOLVED ✅

One of the maintainers of NUnit confirmed that the newest NUnit Console had an issue. Downgrading from 3.16.x to 3.15.5 resolved the issue.

More info on: nunit/nunit#4579

Toubleshooting NUnit4 with MSBUILD

Background

When migrating from NUnit 3 to NUnit 4 everything works as expected when building with dotnet:

  • dotnet build
  • dotnet test

It also works when using msbuild for dotnet:

  • dotnet msbuild -target:Build

But fails when using plain msbuild together with NUnit ConsoleRunner:

  • msbuild /t:Build
  • NUnit.ConsoleRunner.3.16.3\tools\nunit3-console.exe .\bin\Debug\net48\NUnit4Test.dll

The error message is that the file is invalid as there were no suitable tests found:

1) Invalid : .\bin\Debug\net48\NUnit4Test.dll
No suitable tests found in '.\bin\Debug\net48\NUnit4Test.dll'.
Either assembly contains no tests or proper test driver has not been found.

Important

My project are targetting .NET Framework and are using the task ResolveCOMReference that is not supported by dotnet msbuild, and this is the reason to still use the old msbuild. More info: https://learn.microsoft.com/nb-no/visualstudio/msbuild/resolvecomreference-task?view=vs-2022#msb4803-error

Demonstration

This repository has a minimal example that demonstrates my issue. It has configured a GitHub Action workflow to build and test using msbuild and NUnit.ConsoleRunner:

- name: Build Debug for Test
  run: msbuild /t:Rebuild /p:Configuration=Debug

- name: Run tests
  run: .\packages\NUnit.ConsoleRunner.3.16.3\tools\nunit3-console.exe .\bin\Debug\net48\NUnit4Test.dll

The branch main is building with <PackageReference Include="NUnit" Version="3.14.0" />.

The branch nunit4 is building with <PackageReference Include="NUnit" Version="4.0.0" />.

Further both branches are using:

  • <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
  • <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />

Tip

Local testing can be done by running build-and-test.ps1.

Test results

The branch with NUnit 3.14.0 is succeeding, and the branch with NUnit 4.0 is failing:

image

Ref: https://github.com/Gakk/Nunit4Test/actions/workflows/ci.yml

NUnit 3

NUnit.ConsoleRunner.3.16.3\tools\nunit3-console.exe .\bin\Debug\net48\NUnit4Test.dll
NUnit Console 3.16.3 (Release)
Copyright (c) 2022 Charlie Poole, Rob Prouse
Tuesday, December 5, 2023 10:33:34 AM

Runtime Environment
   OS Version: Microsoft Windows NT 6.2.9200.0
   Runtime: .NET Framework CLR v4.0.30319.42000

Test Files
    .\bin\Debug\net48\NUnit4Test.dll


Run Settings
    DisposeRunners: True
    WorkDirectory: D:\a\Nunit4Test\Nunit4Test
    ImageRuntimeVersion: 4.0.30319
    ImageTargetFrameworkName: .NETFramework,Version=v4.8
    ImageRequiresX86: True
    RunAsX86: True
    ImageRequiresDefaultAppDomainAssemblyResolver: False
    TargetRuntimeFramework: net-4.8
    NumberOfTestWorkers: 4

Test Run Summary
  Overall result: Passed
  Test Count: 1, Passed: 1, Failed: 0, Warnings: 0, Inconclusive: 0, Skipped: 0

Ref: https://github.com/Gakk/Nunit4Test/actions/runs/7099460949/job/19323504665

NUnit 4

NUnit.ConsoleRunner.3.16.3\tools\nunit3-console.exe .\bin\Debug\net48\NUnit4Test.dll
NUnit Console 3.16.3 (Release)
Copyright (c) 2022 Charlie Poole, Rob Prouse
Tuesday, December 5, 2023 12:06:28 PM

Runtime Environment
   OS Version: Microsoft Windows NT 6.2.9200.0
   Runtime: .NET Framework CLR v4.0.30319.42000

Test Files
    .\bin\Debug\net48\NUnit4Test.dll


Errors, Failures and Warnings

1) Invalid : D:\a\Nunit4Test\Nunit4Test\bin\Debug\net48\NUnit4Test.dll
No suitable tests found in 'D:\a\Nunit4Test\Nunit4Test\bin\Debug\net48\NUnit4Test.dll'.
Either assembly contains no tests or proper test driver has not been found.

Test Run Summary
  Overall result: Failed
  Test Count: 0, Passed: 0, Failed: 0, Warnings: 0, Inconclusive: 0, Skipped: 0

Ref: https://github.com/Gakk/Nunit4Test/actions/runs/7100454106/job/19326575405

Open questions

  • Is NUnit4 not working with old msbuild?
  • Is NUnit4 not compatible with NUnit3TestAdapter?
  • Is NUnit4 not supported by nunit3-console?

And follow-up, will there be released a NUnit4TestAdapter or nunit4-console?