mutation-testing

SKILL.md

Mutation testing evaluates test quality by introducing small, deliberate bugs (mutations) into code and checking if tests catch them. This provides a behavioral measure of test effectiveness beyond simple coverage metrics.

Why mutation testing matters: Tests can achieve 100% line coverage while missing critical bugs. Mutation testing reveals if tests actually verify behavior or just execute code.

This skill uses Go's go/ast and go/parser packages to generate intelligent mutations by analyzing code structure.

Validates test suite quality through mutation testing. Generates intelligent code mutations, runs tests to verify they catch the changes, and identifies gaps in test coverage. Use when evaluating test effectiveness, validating newly written tests, or improving test quality for mission-critical code. Source: roasbeef/claude-files.

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