tdd-practices

From README

TDD Practices Red-Green-Refactor The fundamental TDD cycle: RED — Write a failing test that describes the behavior you want. Run it. Watch it fail. This confirms the test is actually testing something. GREEN — Write the minimum code to make the test pass. No more. Resist the urge to build ahead. REFACTOR — Clean up duplication, improve naming, extract patterns. Tests protect you from breaking anything. Each cycle should take minutes, not hours. Small cycles build confidence and momentum. Outside-In Double-Loop (Onion/Hexagonal) For architectures with clear layer boundaries: Outer loop: Integration test at the boundary (HTTP request in, response out). Stays RED until all inner layers are wired. Inner loop: Unit tests for each layer, working inward: Inbound adapter (controller/handler): test request parsing, response shaping Use case + domain: test business rules with mocked outbound ports. Domain is PURE — zero external dependencies.