What problem does it solve?
It prevents production bugs and regressions by forcing a strict test-first workflow: write a failing test before writing any production code.
Core Features & Use Cases
- Strict RED-GREEN-REFACTOR cycle: enforce a failing test, minimal code to pass, then refactor while staying green.
- Scope detection & setup: identifies the project’s test framework (e.g., Jest/Vitest/Pytest/Mocha) and ensures the framework exists before implementation.
- TDD-first execution: applies to new features, bug fixes, refactors, and behavior changes to ensure each behavior is proven by an automated test.
Example Use Case: You need to change how a function handles invalid input; write one behavior-focused test for the expected error/response, implement the minimum behavior to satisfy it, then refactor without breaking the established contract.
Quick Start
Ask your AI to apply TDD by writing a single failing test for the next behavior you want, implementing the minimum code to make it pass, and then refactoring only after the test stays green.