July 2024
Beginner to intermediate
272 pages
5h 40m
Japanese
Content preview from アーキテクトの教科書 価値を生むソフトウェアのアーキテクチャ構築
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205
5
Column
テストダブル
テストダブルには図5.2.5 に示すバリエーションがあります
※3
。ここで、
SUT（System Under Test）はユニットテストにおけるテスト対象ユニット
を、DOC（Depended-On Component）はSUTが依存するユニットを指し
ます。テストダブルは、ユニットテスト時に実際のDOCを置き換えて利用
されます。
これらのテストダブルは、開発者がコードを実装して用意することもでき
ますが、APIを用いてテストダブルの生成や設定を容易に行うことができる
テストダブルライブラリの利用も可能です（テストフレームワークによって
は、標準機能でテストダブル生成をサポートするものもあります）。
振る舞いの単位
もう一つのユニットの捉え方は、コンポーネントを最小単位と見なす
考え方です。
書籍『レガシーコードからの脱却 ソフトウェアの寿命を延ばし価値
を高める9つのプラクティス』
※4
ではユニットテストのユニットを以下
のように説明しています。
⹅
図5.2.5
テストダブルのバリエーション
バリエーション 概要
スタブ
（Test Stub）
実際のDOC の代わりに適切な応答を行い、メソッド呼び出
しに対して所定の結果を返す。
スパイ
（Test Spy）
テストスタブの機能に加え、SUTからのメソッド呼び出し
を記録して後から検証する機能を持つ。
モック
（Mock Object）
SUT からDOC に対する相互作用の期待値を事前に定義し、
期待どおりの相互作用が発生したかどうかを検証すること ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.