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Coverlet is a cross-platform code coverage framework for .NET that collects statement, branch and method coverage during unit and integration test runs. It integrates with dotnet test, MSBuild and third-party runners and emits reports in multiple formats. Suitable for local development and CI pipelines to measure and enforce coverage thresholds.
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Coverlet is a cross-platform open-source tool that collects code coverage for .NET assemblies during automated test runs.
The project emerged in the .NET ecosystem as an easily integrated alternative for coverage measurement across operating systems and CI platforms.
Coverlet instruments compiled assemblies before testing and counts executed lines, branches, and methods. After the run it restores originals and writes reports such as Cobertura, OpenCover, LCOV, or JSON. MSBuild and collector integrations connect it to dotnet test.
Additional probes record which compiled code executes.
Line, branch, and method values reveal untested areas.
Collector and MSBuild connect measurement with local and CI test runs.
Coverlet exposes test gaps and supports quality gates. A high percentage does not prove strong assertions or relevant scenarios; coverage should serve as a targeted diagnostic indicator.
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