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    # DDD Applied - Introducing TDD while breaking down legacy monolith 解析極限編程 XP Code Review > pair programing 測試 > 單元測試,用戶功能測試,先寫測試 架構設計 > 持續重構 簡化設計 > 追求最簡單的實作 集成測試 > 持續集成 增量變化 Incremental changes 假設的簡單性 assumed simplicity 快速反饋快速覆盤 Rapid feedback 擁抱變化 Embracing change 有品質的實作 Quality work ## 為什麼用 TDD? * 驗證代碼是否正常工作 * 防止未來的功能倒退 * 記錄程式碼的行為 * 提供設計指導 * 支持重構 持久的高速開發 ↓ 簡潔代碼 ↓ 重構 ↓ 信心 ↓ 測試 ## TDD 三部曲 * 編寫測試案例 * 運行測試 > 紅 * 編寫最簡單程式碼去通過測試 * 運行測試 > 綠 * 重構改進簡化 ## 黑盒測試 * 從用戶或外部服務的角度進行功能測試 * 測試不了解內部代碼 * 系統的輸入和輸出測試 * 極少的模擬組建與依賴 * 端到端測試 End-to-End 通常是黑盒測試 ## 實例方案 * 分析現有單體系統 * 識別潛在服務 * 尋找第一個開發的服務 * 獨立的、高業務價值 * 開始用 TDD 開發第一個服務 * 部署到 pre prod、prod * 復盤和擴展 ## 契約測試 > 關注不同組建之間的接口和交互 > 適用於微服務架構 * 生產者與消費者 * 生產者是提供服務或數據的組件,消費者是一來這些服務或數據的組件 * 測試用例會驗證生產者是否按照契約生成正確的數據,以及消費者是否正確的使用這些數據 ## 為什麼要盡快部署到 production * prod 是最終的驗證 * 只有 production 實戰的無缺陷才真正提供業務價值 * pre-prod 與 prod 環境必須幾乎相同 ## 暗部署 Dark Deploy * 並行部署 * 新代碼或功能會並行部署現有的生產版本旁邊 * 對最終用戶隱藏的新代碼部署 * 用戶會繼續使用當前生產版本 * 隔離與當前的生產版本 * 主要用於測試和驗證 ## Strangler Fig Pattern > [Microsoft 提供的說明](https://learn.microsoft.com/zh-tw/azure/architecture/patterns/strangler-fig)

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