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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測試程式的結構
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103
測試名稱不需要遵循產品程式的樣式慣例，它們實際上來自它們自己的領域特定語言。
你會很常看到較長的方法名稱與毫無節制地使用底線，就算在 C# 與 Java 等不太使用它
們的語言也是如此（有人認為
strings_can_be_capitalised
比較不需要眯著眼睛閱讀）。
測試程式的結構
確保你的測試套件涵蓋程式的重要功能。考慮“一般”的輸入情況。也考慮共通的“失
敗情況”。考慮臨界值會發生什麼事情，包括空或零狀態。使用系統與整合測試來涵蓋
整個系統的所有功能與所有需求，及使用單位測試來涵蓋所有的程式碼，都是值得稱許
的做法。但是你可能需要很認真地工作。
不要重複測試項：它會增加勞力、混亂與維護成本。每一個你所寫的測試案例都驗證一
項事實，那個事實不需要再次驗證，無論是在第二次測試，或測試其他東西的其中一部
分。如果你的第一個測試案例會在建構物件之後檢查先決條件，你就可以假設這個先決
條件在每一個你所寫的測試案例都成立—不需要在每次重新建構物件時都重新檢查。
常見的錯誤是：看到一個類別有五個方法，就認為你需要五個測試程式，每一個測試程
式負責一個方法。這是可以理解（但天真）的做法。以函式為基礎的測試經常是不實用
的，因為你通常無法獨立測試一個方法。呼叫它之後，你會需要使用其他的方法來檢視
物件的狀態。[Page-97]
相反，編寫測試程式來逐一測試程式碼的特定行為。這會產生更凝聚且更明確的測試組
合。
維護測試程式
你的測試程式碼與產品程式碼一樣重要，所以謹慎考慮它的外形與結構。如果它變混 ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.