Mutation Testing for Critical Code
Quick Reference
What & Why
Definition
>= 50% of critical business logic code (payment, auth, data processing) uses mutation testing to validate test quality.
Business Value
Catches performance regressions 100% of the time before production and reduces visual bugs by 90% through automated regression testing Achieving >= 50% critical code mutation tested is a key milestone toward this goal.
Context
This capability is part of the Acceleration milestone's focus on scale automation, embed compliance, improve speed & reliability. Essential for teams targeting CFR, LT improvements.
Success Criteria
Target
>= 50% critical code mutation tested
Measurement
Mutation coverage for designated critical modules
Evidence
- Mutation test reports
- Critical code module list
- Mutation score trends
In Practice
Real-World Implementation
Teams run Stryker/PITest on critical modules, aim for >= 70% mutation score. Mutations include: flip conditionals, change operators, remove returns.
Concrete Example
Implementation Guide
Prerequisites
Implementation Steps
Follow the measurement approach: Mutation coverage for designated critical modules
For detailed step-by-step guidance, refer to the Advanced Testing & Performance Validation Implementation Kit.
Resources
Implementation Kit
Advanced Testing & Performance Validation KitTemplates
Browse all templatesRelated Resources
View learning pathsRelated Capabilities
Prerequisites
Implement these first
Complementary
Often adopted together, from the Advanced Testing & Performance Validation epic
Troubleshooting & FAQs
Common Issues
Issue: Target metric not improving
Solution: Verify measurement is accurate, check if prerequisites are fully implemented, review evidence artifacts for completeness
Issue: Team resistance to adoption
Solution: Start with pilot team, demonstrate value with metrics, provide training and support during transition
Issue: Inconsistent implementation across teams
Solution: Create shared templates and guidelines, establish regular sync meetings, use automation to enforce standards
Frequently Asked Questions
Can we implement this before completing prerequisites?
While possible, it's not recommended. Prerequisites ensure foundational practices are in place, making this capability more effective and easier to adopt.
How long does implementation typically take?
Most capabilities can be implemented within 90 days when tackled as part of the Acceleration milestone. Individual timelines vary based on team size and existing practices.