Running .NET Core Tests and collecting coverage with Azure Pipelines

Installing Coverlet

Coverlet is an open source project that produces code coverage reports.

https://github.com/coverlet-coverage/coverlet

In Visual Studio install the coverlet.collector and coverlet.msbuild NuGet package.

nuget install coverlet.collector

nuget install coverlet.msbuild

Running Coverlet Locally

dotnet test /p:CollectCoverage=true

Viewing Coverage in Visual Studio

This Visual Studio 2022 extension allows you to view coverage line by line and as a summary

https://marketplace.visualstudio.com/items?itemName=FortuneNgwenya.FineCodeCoverage

Defining the Azure Pipeline

Using the wizard follow the steps below.

Use the .NET Core SDK

Select the .NET Core SDK appropriate for your project.

Perform a .NET Restore

A restore will download the Nuget packages for your project.

Perform a .NET Build

Run the Tests

Ensure to define the arguments to collect coverage

Publish the Code Coverage

Task version 1 will be deprecated. See this post from Microsoft:

https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/publish-code-coverage-results-v2?view=azure-pipelines