Mutation Testing

Validate test suite quality by introducing code mutations and verifying tests detect them. This skill implements Phase 8 of the 8-phase testing methodology - the final validation phase.

When to Use This Skill

Use this skill when you need to:

• Validate test suite effectiveness
• Detect weak or superficial tests
• Find "reward hacking" patterns
• Improve test quality beyond coverage
• Verify tests catch real bugs
• Identify tests that always pass
• Strengthen assertions

Trigger phrases: "mutation testing", "test quality", "reward hacking", "mutants", "test effectiveness", "weak tests", "mutation score", "pitest", "mutmut"

What This Skill Does