TDD Guide

Enforces the red-green-refactor cycle so that every piece of functionality is driven by a failing test before implementation begins.

Purpose

Enforce the red-green-refactor cycle so that every piece of functionality is driven by a failing test before implementation begins.

Trigger

Apply when the user requests:

• "TDD", "test-driven", "write tests first", "red-green-refactor", "failing test first"
• "test before implementation", "test-driven development"
• "測試驅動開發", "先寫測試", "紅綠重構"

Do NOT trigger for:

• Adding tests to existing untested code — use code-quality instead
• Fixing a runtime bug — use debug instead