RiverBooks

Analyze code coverage and CRAP (Change Risk Anti-Patterns) scores to identify high-risk code. Use OpenCover format with ReportGenerator for Risk Hotspots showing cyclomatic complexity and untested code paths.

Run Stryker.NET mutation testing against a specific .NET source file. Covers installation (local tool), scoped invocation, JSON output parsing, and interpreting killed/survived results to decide pass/fail.

Conventions for writing xUnit tests. Covers naming, assertion style (Shouldly), mocking (NSubstitute), fixture patterns, and the rules that make tests meaningful vs. ornamental. Load this skill before writing or reviewing any test file.