Azure Dev Ops test step not finding tests (.net 5) - azure-devops

Question

I have a simple .net 5 project that contains a main project and a unit test project with nUnit3 tests. On my machine (a mac with visual studio for mac fwiw) tests are discovered on build and work as expected.
When I try and set up a build pipeline in Azure dev ops, none of my tests are discovered and I get the follow line in the logs:
Test run detected DLL(s) which were built for different framework and platform versions. Following DLL(s) do not match current settings, which are .NETFramework,Version=v4.0 framework and X86 platform.
GenericRepositoryTests.dll is built for Framework .NETCoreApp,Version=v5.0 and Platform AnyCPU.
Microsoft.TestPlatform.CommunicationUtilities.dll is built for Framework .NETStandard,Version=v2.0 and Platform AnyCPU.
There are more Microsoft dlls it reports but you get the idea. Here is my yaml file for the build process:
# ASP.NET Core (.NET Framework)
# Build and test ASP.NET Core projects targeting the full .NET Framework.
# Add steps that publish symbols, save build artifacts, and more:
# https://learn.microsoft.com/azure/devops/pipelines/languages/dotnet-core
trigger:
- main
pool:
vmImage: 'windows-latest'
variables:
solution: '**/*.sln'
buildPlatform: 'Any CPU'
buildConfiguration: 'Release'
steps:
# Added this step manually
- task: UseDotNet#2
displayName: 'Use .NET Core sdk 5.0.100'
inputs:
packageType: 'sdk'
version: '5.0.100'
includePreviewVersions: true
# Added this step manually
- task: DotNetCoreCLI#2
displayName: 'dotnet restore'
inputs:
command: restore
projects: '**/*.csproj'
- task: NuGetToolInstaller#1
- task: NuGetCommand#2
inputs:
restoreSolution: '$(solution)'
- task: VSBuild#1
inputs:
solution: '$(solution)'
msbuildArgs: '/p:DeployOnBuild=true /p:WebPublishMethod=Package /p:PackageAsSingleFile=true /p:SkipInvalidConfigurations=true /p:DesktopBuildPackageLocation="$(build.artifactStagingDirectory)\WebApp.zip" /p:DeployIisAppPath="Default Web Site"'
platform: '$(buildPlatform)'
configuration: '$(buildConfiguration)'
- task: VSTest#2
inputs:
testSelector: 'testAssemblies'
testAssemblyVer2: |
**\*test*.dll
!**\*TestAdapter.dll
!**\obj\**
searchFolder: '$(System.DefaultWorkingDirectory)'
codeCoverageEnabled: true
How can I make sure the Azure Dev Ops test runner settings are set up to run .net 5 dlls?
Thanks

Answer 1

Thanks to jessehouwing I found that the answer I needed was to use dotnet test rather than VSTest:
Here is my final pipeline:
trigger:
- main
pool:
vmImage: 'windows-latest'
variables:
solution: '**/*.sln'
buildPlatform: 'Any CPU'
buildConfiguration: 'Release'
steps:
- task: UseDotNet#2
displayName: 'Use .NET Core sdk 5.0.100'
inputs:
packageType: 'sdk'
version: '5.0.100'
includePreviewVersions: true
- task: DotNetCoreCLI#2
displayName: 'dotnet restore'
inputs:
command: restore
projects: '**/*.csproj'
- task: DotNetCoreCLI#2
displayName: 'dotnet build'
inputs:
command: 'build'
projects: '**/*.sln'
- task: DotNetCoreCLI#2
displayName: 'dotnet test'
inputs:
command: 'test'
projects: '**/*tests.csproj'
arguments: '--configuration $(buildConfiguration) --collect "Code coverage"'
testRunTitle: 'Generic Repository Tests'

Answer 2

Please try to install the NUnit3TestAdapter <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" /> and then check the result.
See: TFS Tests do not match framework settings for more workarounds.

Answer 3

.csproj
<PackageReference Include="coverlet.collector" Version="3.2.0">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>
Pipeline
trigger: none
pr: none
pool:
vmImage: 'windows-latest'
stages:
- stage: CreateDeploymentArtifacts
displayName: Create Deployment Artifacts
jobs:
- job: Test
displayName: Run Xunit test
steps:
- task: DotNetCoreCLI#2
displayName: 'Restore Packages'
inputs:
command: 'restore'
projects: 'LegalRegTech.Web.sln'
- task: DotNetCoreCLI#2
displayName: 'Build application'
inputs:
command: 'build'
projects: 'LegalRegTech.Web.sln'
arguments: '--no-restore'
- task: DotNetCoreCLI#2
displayName: 'Run tests'
inputs:
command: 'test'
projects: '**/*tests.csproj'
arguments: '--collect:"XPlat Code Coverage"'
- script: 'dotnet tool install -g dotnet-reportgenerator-globaltool'
displayName: 'Install ReportGenerator tool'
- script: 'reportgenerator -reports:$(Agent.TempDirectory)/**/coverage.cobertura.xml -targetdir:$(Build.SourcesDirectory)/coverlet/reports -reporttypes:"Cobertura"'
displayName: 'Create reports'
- task: PublishCodeCoverageResults#1
displayName: 'Publish code coverage'
inputs:
codeCoverageTool: Cobertura
summaryFileLocation: '$(Build.SourcesDirectory)/coverlet/reports/Cobertura.xml'