Code coverage with Coverlet for .NET

Code coverage measures how much of your source code is executed while tests are running, the measurement result is represented in percentage, and one or more coverage criteria are used as rules which tests must satisfy.

Why measure code coverage? Doing that assures you that the program with a higher code coverage percentage will have a lower chance of undetected bugs.

Coverlet supports coverage results in several formats. The output format can be configured by CoverletOutputFormat property with values: json (default), lcov, opencover, cobertura, and teamcity.

It also supports VSTest and MSBuild type of integration, plus its own coverlet dotnet tool.

To get the advantage of Coverlet with MSBuild, you have only to add coverlet.msbuild to your test projects.

IMPORTANT: Only add the package reference to the test projects.

You will find the packages below in your project file.

Once added, you have to run your tests, passing some parameters to the test tool.

It will produce the typical test output plus the coverage results, as shown:

That’s all, and happy testing!

If you also want to push your code coverage to SonarQube, check this other article out:

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