TDD Best Practices

Test-Driven Development with behavior-focused testing, factory patterns, and the Red-Green-Refactor cycle.

Core Principle

Every single line of production code must be written in response to a failing test.

This is non-negotiable. If you're typing production code without a failing test demanding it, you're not doing TDD.

The Sacred Cycle: Red → Green → Refactor

1. RED - Write a Failing Test

Write a test that describes the desired behavior. The test must fail because the behavior doesn't exist yet.

Rules: