Test-Driven Development

Use a few behavior tests through the public interface. This skill is opt-in when the user asks for TDD/test-first, or repository instructions require that cycle. Follow codebase-design for shared readability rules and when-to-write-tests for test scope.

When to use

• The user asked for TDD, test-first, or red-green-refactor
• Repository instructions require a failing-test-first cycle for the change

When not to use