Code Coverage for Azure DevOps

1. In your Visual Studio solution, add a unit test project (end of name with Tests).
2. Reference the Nuget package coverlet.msbuild which will be used as an extension of the dotnet test command used later.

dotnet test --configuration Release /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura /p:CoverletOutput=./TestResults/Coverage/

reportgenerator -reports:.\TestResults\Coverage\coverage.cobertura.xml -targetdir:.\CodeCoverage -reporttypes:HtmlInline_AzurePipelines

1. In Azure DevOps Pipeline Build, add a task .NET Core to perform unit tests and collect data on code coverage (via coverlet). This task will generate a coverage.cobertura.xml file in your test project folder, in Cobertura format which is supported by Azure DevOps.
   • Commande : Test
   • Path to projet(s) : **/*[Tt]ests/*.csproj
   • Arguments : --configuration $(BuildConfiguration) /p:CollectCoverage=true /p:CoverletOutput=./TestResults/Coverage/ /p:CoverletOutputFormat=cobertura
   • Publish test results and code coverage : checked
2. Via the Marketplace, add the extension[ReportGenerator] (https://marketplace.visualstudio.com/items?itemName=Palmmedia.reportgenerator) (from Palmmedia) and this task in your Pipeline:
   • Reports : **/coverage.cobertura.xml
   • Target directory : CoverageReport
   • Report types: HtmlInline_AzurePipelines;Cobertura
   This task will generate an HTML report of the coverage code (supported by Azure), in the /CoverageReport folder.
3. Add a task Publish code coverage results to publish the HTML report in a Coverage tab of the Build Summary.
   • Code coverage tool : Cobertura
   • Summary file : **/coverage.cobertura.xml
   • Report dyrectory : CoverageReport

Exclude Any assembly:
reportgenerator -assemblyfilters:-BuildLibrary -reports:.\TestResults\Coverage\coverage.cobertura.xml -targetdir:.\CodeCoverage -reporttypes:HtmlInline_AzurePipelines

+ to include and - to exclude and Name of the assembly without extension.
File Filter:

reportgenerator -filefilters:-*Reference.cs* -reports:.\TestResults\Coverage\coverage.cobertura.xml -targetdir:.\CodeCoverage -reporttypes:HtmlInline_AzurePipelines

Ref:

Azure DevOps and the Code Coverage

https://www.youtube.com/watch?v=VE-chjDd3M4