What problem does it solve?
Prevents untested, fragile, or incorrect implementations by ensuring developers specify desired behavior as failing tests before writing production code.
Core Features & Use Cases
- Test-first workflow: Requires writing a failing acceptance test, then using Red-Green-Refactor cycles on unit tests to drive implementation.
- Quality guardrails: Ensures each change is verified by tests, reduces regressions, and documents intended behavior.
- Use Cases: Implementing new features, fixing bugs, refactoring modules, and validating behavior changes across codebases.
Quick Start
Write a failing acceptance test that describes the feature from the user's perspective, run the tests to confirm the failure, then implement the minimal code to make it pass and refactor while keeping tests green.