Test-Driven Refactoring

Safely refactor code by establishing test coverage first, making incremental changes, and continuously verifying behavior is preserved.

When to Use This Skill

• Refactoring legacy code without adequate tests
• Improving code structure while preserving behavior
• Adding tests to existing code before modification
• Migrating or rewriting systems incrementally
• Reducing risk when changing critical code paths

Core Principles

The Refactoring Safety Net