dotnet core code coverage using AltCover and ReportGenerator
AltCover is awesome!!
Code coverage for dotnet core
Some of the traditional code coverage tools for .Net have still not yet been ported for dotnetcore.
A while back, I was tasked in finding a code coverage tool to integrate into our build process. I found that with altcover, rather than hooking into the .net profiling API at run-time, it works by weaving the same sort of extra IL into the assemblies of interest ahead of execution.
AltCover can be included as a NuGet package, or you can install it as a global tool, which is handy for say build agents.
How to install
dotnet tool install --global altcover.global
dotnet add package AltCover
How to run
dotnet test /p:AltCover=true
This will output a coverage.xml file in opencover format.
You can then run ReportGenerator on the coverage file to genetate a UI to visualise the data.
Here is a full example of the command we use, which we then include as a coverage report inside our build process.
dotnet test /p:AltCover=true /p:AltCoverXmlreport=".\coverage.xml" /p:AltCoverAssemblyFilter="NUnit" /p:AltCoverThreshold=80 /p:AltCoverAttributeFilter="ExcludeFromCodeCoverage" reportgenerator -reports:src/SalesImportApi.Tests/coverage.xml -targetdir:./coverage
Written on March 15, 2019.