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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203
5
ユニットテスト（Unit Testing）は、ソフトウェアを構成する最小単
位（ユニット）の振る舞いが正しいことを検証するテストです。ユニッ
トを具体的にどのような単位として捉えるかについては、二通りの考え
方があります。
プログラムの最小単位
一つ目は、文字通りプログラムの最小単位と見なす考え方です。オブ
ジェクト指向言語の場合はクラスがそれにあたります。クラスごとに対
応するユニットテストクラスを作成します（図 5.2.2）。
⹅
図5.2.2
クラスごとのユニットテスト
Foo
FooTest
Bar
BarTest
一般に、ユニットテストは他のユニットから独立してテストを実施す
べきだとされています。もし他のユニットへの依存がある場合、実際の
依存先ユニットを模倣して振る舞うテストダブルと呼ばれるユニットで
代替します（図5.2.3）。図の
BarStub
クラスが
Bar
クラスを代替するテ
ストダブルです。
⹅
図5.2.3
テストダブルの利用
Foo
FooTest
Bar
BarTest
BarStub
204
この方法のメリットは、個々のクラスに対して必ずテストクラスを一
つ作成するため、ルールがシンプルでわかりやすいことです。また、図
のBarクラスが実装されるより先に
Foo
クラスの実装とテストを行うこ
とができます。つまり依存関係の制約から解放されるのです。 ...
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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.