Question 1

How do I set up Coverlet for a .NET Core xUnit test project?

Accepted Answer

Add the coverlet.collector package to your test project, then run `dotnet test --collect:"XPlat Code Coverage"`. This generates a Cobertura XML report in the TestResults folder, as outlined in the VSTest integration guide.

Question 2

Coverlet vs OpenCover: which is better for .NET Framework?

Accepted Answer

Coverlet is cross-platform and modern, while OpenCover is Windows-only but supports older .NET versions more seamlessly. For new projects or cross-platform needs, Coverlet is superior; for Windows-centric legacy systems, OpenCover might be easier.

Question 3

Why does my Coverlet report show zero coverage?

Accepted Answer

Common causes include missing PDB files, incorrect assembly filters, or using the wrong driver for your test runner. Ensure your project is SDK-style and check the known issues section for troubleshooting early process termination with VSTest.

Question 4

How to exclude test assemblies in Coverlet MTP integration?

Accepted Answer

Use the `--coverlet-exclude` option with filters like `[xunit.]` when running tests, as shown in the MTP usage examples. This allows you to skip test code from coverage calculations for more accurate metrics.

Question 5

Does Coverlet work with .NET Framework 4.8?

Accepted Answer

Yes, but only if the project uses SDK-style format. If your .NET Framework 4.8 project has an old csproj, you'll need to migrate it first, which can be a limitation for unupdated codebases.

Question 6

How to integrate Coverlet into GitHub Actions CI?

Accepted Answer

Run `dotnet test` with coverage collection flags, then use the Cobertura output with a tool like Codecov or ReportGenerator. Coverlet's flexible formats make it straightforward to embed in YAML workflows for automated reporting.

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