dotnet-add-testing

Add test infrastructure scaffolding to an existing .NET project. Creates test projects with xUnit, configures code coverage with coverlet, and sets up the conventional directory structure.

Scope boundary: This skill provides test project scaffolding only. For in-depth testing patterns -- xUnit v3 features, integration testing with WebApplicationFactory, UI testing, snapshot testing, test quality metrics, and testing strategy guidance -- see [skill:dotnet-testing-strategy] and the related testing skills.

Prerequisites: Run [skill:dotnet-version-detection] first to determine SDK version and TFM. Run [skill:dotnet-project-analysis] to understand existing solution structure.

Cross-references: [skill:dotnet-project-structure] for overall solution layout conventions, [skill:dotnet-scaffold-project] which includes test scaffolding in new projects, [skill:dotnet-add-analyzers] for test-specific analyzer suppressions.

Test Project Structure

Follow the convention of mirroring src/ project names under tests/: