Refactoring

Refactoring is the final step of TDD. After mutation testing confirms test strength, assess if refactoring adds value.

When to Refactor

• Always assess after mutation testing confirms test strength
• Only refactor if it improves the code
• Commit working code BEFORE refactoring (critical safety net)

Commit Before Refactoring - WHY

Having a working baseline before refactoring:

• Allows reverting if refactoring breaks things
• Provides safety net for experimentation
• Makes refactoring less risky
• Shows clear separation in git history