TDD Reference

Practical guidance for test-driven development: writing good tests, designing testable interfaces, mocking correctly, and refactoring safely.

Scope Constraints

• Read-only reference skill — provides guidance, does not modify code
• Does not run tests, generate test files, or configure test runners
• Complements superpowers:test-driven-development workflow skill

Inputs

• Context (required): What the user is testing or designing
• Phase (optional): red (writing failing test), green (making it pass), refactor (cleaning up)

Input Sanitization

• Context descriptions: free text, reject null bytes.