最近有人來訊問了”你知道TDD是什麼嗎?”，所以這邊就對 TDD 做一下簡單介紹以及個人了解，方便新手去簡單理解，如果有錯，歡迎告知指證。
TDD，全名為 Test-driven development，中文翻譯 “測試驅動開發”，維基百科官方解釋
測試驅動開發是戴兩頂帽子思考的開發方式：先戴上實現功能的帽子，在測試的輔助下，快速實現其功能；再戴上重構的帽子，在測試的保護下，通過去除冗餘的代碼，提高代碼品質。測試驅動著整個開發過程：首先，驅動代碼的設計和功能的實現；其後，驅動代碼的再設計和重構。
維基百科
TDD 簡單介紹
你可以常常在敏捷開發中一併聽到，我自己的理解，TDD 這段解釋，可以把產品開發的週期，切割為兩個區塊，分別為前期發佈期與後期完善期。
前期發佈期
前期目標訂在能用最快的方式將產品發佈到市場，所以主軸定在功能有對就行，透過大量測試，去看缺少那些功能並逐一完善，已達用最快速的方式將產品推向市場。
後期完善期
這裡雖然用完善期來描素，但其實…稱之為還債期個人覺得比較貼切。
在產品開發上，原先流程都是規劃到執行，但因為前者是測試到執行，自然在架構上、安全性、程式代碼等，都構築了不少的技術債。
所以，這時會依據這些技術債與衍生問題，回頭梳理並重新規劃，使其重構後的產品能更加完善。
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