May 2015
Intermediate to advanced
376 pages
5h 48m
Chinese
Content preview from 成為卓越程式設計師的38項必修法則
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98
| 第十一章：測試時間
4.
回到第 1 步驟並重複執行，直到寫出所有功能都能通過的測試程式為止。
這是一個強大、精簡的回饋回路。它通常被簡稱為
紅綠重構
週期，以紀念單位測試工具
會將失敗的測試顯示為紅色的進度條，通過的測試顯示為綠色條。
就算你不遵守優先測試原則，也請你簡短回饋回路，並在每一段程式或它的附近編寫單
位測試。單位測試真的可以協助“驅動”我們的設計：它不但可以確保每一個東西的功
能都正確，也可以避免錯誤回歸，它也是瞭解產品怎麼使用某個類別 API 的好方法—如
何輕鬆且簡潔。這是非常寶貴的回饋。測試程式也可以當成實用的文件，說明如何使用
類別，在它完成時。[Page-92]
重點
在你編寫
被測試的程式碼時，編寫測試程式。不要之後再編寫測試程
式，否則你的測試程式將不會有同樣的效果。
這個早期測試、經常測試的做法可套用到單位、整合及系統層級。就算你的專案沒有自
動系統測試的基礎結構，你也可以承擔責任，並使用單位測試程式來驗證你所寫的程
式。它成本很低，而且因為良好的程式結構，也很簡單
2
。
另一個重要的測試程式編寫時間是當你必須修改產品程式的 bug 時。請不要急忙地開始
修改程式，先編寫一個失敗的單位測試來說明 bug 的原因。有時編寫這種測試程式的動
作可以讓其他相關的程式缺陷顯示出來。接著套用你的修改，並讓測試通過。把這個測
試程式放入測試池，用來確保 bug 不會再度出現。
何時執行測試
只要瞄一眼，你就可以看出很多端倪。
- Yogi Berra
顯然，如果你使用 TDD 來開發，會在開發各個功能時 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.