Testing Mutation

Overview

Use this skill to quantify test effectiveness and prioritize strengthening weak assertions.

Scope Boundaries

• Use when pass-only test status is insufficient for confidence.
• Typical requests:
  • Find weak tests that do not fail when behavior is changed.
  • Use surviving mutants to guide assertion hardening.
  • Quantify test robustness for critical modules.
• Do not use when:
  • Baseline unit/integration coverage is missing.
  • The primary goal is load or capacity benchmarking (performance-*).

Inputs

• Existing tests and module criticality
• Mutation tooling constraints and runtime budget
• Release risk tolerance