What problem does it solve?
Reduces regression risk and developer uncertainty by enforcing a test-first workflow that verifies observable behavior through public interfaces rather than implementation details.
Core Features & Use Cases
- Red‑Green‑Refactor Loop: Guide to write one failing test, implement the minimal code to pass, then refactor safely.
- Integration-style Tests: Prefer tests that exercise real code paths through public APIs to survive refactors.
- Design for Testability: Advice on dependency injection, small interfaces, and deep modules to make testing natural.
- Use Case: Implement a new checkout flow by writing a single integration test that describes the user-visible outcome, make it pass, and iterate until the feature is complete.
Quick Start
Write one failing integration test that describes a single user-visible behavior, implement the minimal code to make it pass, and repeat.