Code Coverage Tab Not Showing a Report in Azure DevOps - asp.net-core

Question

I have a build pipeline for my .NET Core 2.2 web application which has a .NET Core task for running the tests. However, after running my pipeline and checking the code coverage tab I got the message below.
Is there anything missing that I forgot to do or set up?

Answer 1

You can try below steps to publish the code coverage.
1, First you need to make sure your project reference to nuget package coverlet.msbuild.
<PackageReference Include="coverlet.msbuild" Version="2.5.1">
<PrivateAssets>all</PrivateAssets>
<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
</PackageReference>
2, Download the report generator by running a custom dotnet command install --tool-path . dotnet-reportgenerator-globaltool See below example in yaml format.
- task: DotNetCoreCLI#2
inputs:
command: custom
custom: tool
arguments: install --tool-path . dotnet-reportgenerator-globaltool
displayName: Install ReportGenerator tool
3, Then in your dotnet test task to enable CollectCoverage by adding below arguments:
arguments: '/p:CollectCoverage=true /p:CoverletOutput=$(Build.SourcesDirectory)\TestResult\ /p:CoverletOutputFormat=cobertura'
4, And install task Report Generator to your organization, and in reportgenerator task specify the reports folder to the CoverletOutput folder reports: $(Build.SourcesDirectory)\TestResult\**\coverage.cobertura.xml as sepecified in above dotnet test task /p:CoverletOutput=$(Build.SourcesDirectory)\TestResult\.
See below full example in yaml format:
steps:
- task: UseDotNet#2
inputs:
version: 2.2.x
- task: DotNetCoreCLI#2
inputs:
command: restore
projects: '**\*.csproj'
- task: DotNetCoreCLI#2
inputs:
command: custom
custom: tool
arguments: install --tool-path . dotnet-reportgenerator-globaltool
displayName: Install ReportGenerator tool
- task: DotNetCoreCLI#2
displayName: Test .NET
inputs:
command: test
projects: '**\*Test*.csproj'
publishTestResults: false
arguments: '--configuration $(buildConfiguration) /p:CollectCoverage=true /p:CoverletOutput=$(Build.SourcesDirectory)\TestResult\ /p:CoverletOutputFormat=cobertura'
condition: succeededOrFailed()
- task: reportgenerator#4
inputs:
reports: '$(Build.SourcesDirectory)\TestResult\**\coverage.cobertura.xml'
targetdir: '$(Build.SourcesDirectory)\coverlet\reports'
verbosity: 'Verbose'
condition: succeededOrFailed()
- task: PublishCodeCoverageResults#1
displayName: 'Publish code coverage'
inputs:
codeCoverageTool: Cobertura
summaryFileLocation: $(Build.SourcesDirectory)\coverlet\reports\Cobertura.xml
failIfCoverageEmpty: false
reportDirectory: $(Build.SourcesDirectory)\coverlet\reports\
condition: succeededOrFailed()

Answer 2

You need have this settings:
--configuration $(BuildConfiguration) --collect:"XPlat Code Coverage" You need to install coverlet.collector nuget package.
Then install report generator: install --tool-path . dotnet-reportgenerator-globaltool
Run report generator: ./reportgenerator -reports:$(Agent.TempDirectory)/**/coverage.cobertura.xml -targetdir:$(Build.SourcesDirectory)/coverlet/reports -reporttypes:"Cobertura"
And publish code coverage to get this: