Most legacy code isn’t bad code. It’s just untested. Untested code is scary. You can’t change it with confidence. You fear breaking things. It slows down development.
But there’s a way out of this trap. A proven strategy I’ve used in both startups and corporate environments to turn messy legacy code into clean, testable, and maintainable systems.
Here’s my 6-step approach to refactoring legacy code;
- Break Dependencies
- Characterization testing
- Approval testing
- Property-based testing
- Functional testing to reach 100% coverage
- Refactor the code
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