legacy-code-improvement

To refactor legacy code with no tests, begin by analyzing the codebase to identify key refactoring areas. This Skill guides you through introducing characterization tests and TDD to preserve existing functionality before extracting business logic into separate, testable modules.

Characterization tests are automated tests that capture the current behavior of legacy code before changes. You need them during code modernization to ensure existing functionality is preserved while separating domain logic from technical concerns and refactoring architecture.

The best way to modularize a monolithic legacy application is to separate domain logic from technical concerns. This Skill employs Domain-Driven Design principles to extract core business logic into distinct modules, improving testability, maintainability, and architectural clarity.

Yes, you can use Dependency Inversion to improve legacy code maintainability. This Skill employs Dependency Inversion alongside Domain-Driven Design principles to organize code into clear layers with well-defined dependencies, enhancing overall extensibility and architectural robustness.

Test-Driven Development works for architectural restructuring by providing a safety net through automated testing. This Skill uses TDD and characterization tests to incrementally refactor legacy code into clear layers with well-defined dependencies, ensuring scalability without introducing regressions.