TDD Assistant | TDD 助手

Guide through the Test-Driven Development workflow: Red-Green-Refactor.

引導測試驅動開發（TDD）流程：紅-綠-重構。

TDD Cycle | TDD 循環

    ┌─────┐       ┌───────┐       ┌──────────┐
    │ RED │ ────► │ GREEN │ ────► │ REFACTOR │
    └─────┘       └───────┘       └──────────┘
       ▲                                │
       └────────────────────────────────┘

Workflow | 工作流程

Phase 1: RED - Write Failing Test | 紅燈 - 撰寫失敗測試

• Write a test that describes the desired behavior | 撰寫描述預期行為的測試
• Run tests - confirm it fails for the right reason | 執行測試 - 確認正確地失敗
• Use AAA pattern (Arrange-Act-Assert) | 使用 AAA 模式

Phase 2: GREEN - Make Test Pass | 綠燈 - 讓測試通過

• Write minimum code to pass the test | 撰寫最少的程式碼讓測試通過
• Hardcoding is acceptable at this stage | 此階段可以硬編碼
• Run tests - confirm it passes | 執行測試 - 確認通過

Phase 3: REFACTOR - Improve Code | 重構 - 改善程式碼

• Remove duplication (DRY) | 移除重複
• Improve naming and structure | 改善命名與結構
• Run tests after every change | 每次變更後執行測試
• No new functionality added | 不新增功能

FIRST Principles | FIRST 原則

Principle	Description	說明
Fast	Tests run quickly (< 100ms/unit)	快速執行
Independent	No shared state between tests	測試間無共享狀態
Repeatable	Same result every time	每次結果相同
Self-validating	Clear pass/fail result	明確的通過/失敗
Timely	Written before production code	在產品程式碼之前撰寫

Usage | 使用方式

• /tdd - Start interactive TDD session
• /tdd calculateTotal - TDD for specific function
• /tdd "user can login" - TDD for user story

Reference | 參考

• Detailed guide: guide.md
• Core standard: test-driven-development.md