April 2022
Beginner to intermediate
464 pages
6h 44m
Japanese
Content preview from 実用 Go言語 ―システム開発の現場で知っておきたいアドバイス
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13.5 ウェブサーバーのハンドラーをテストする
Javaの全盛期に広く議論された「アーキテクチャ」の多くは、特定のフレームワークへの依存を減らし、いつでも乗り換えられるようにしましょうというものがほとんどです。実際に乗り換えることは多くありませんが、Goの場合は、標準ライブラリとして提供されているnet/httpのサーバーやクライアントの仕組みが高性能で、どのフレームワークもこの標準ライブラリの上に構築されています。そういう意味ではどのフレームワークを選んでも大きな違いはなく、特定のフレームワークから独立させるためのレイヤーを手作りするメリットもあまりないのが特徴です。
Javaに限りませんが、特定のフレームワークへの依存を除去したアーキテクチャで実現したいことの1つがテストです。Goの場合はフレームワークの外側からリクエストを送信する仕組みが言語に備わっており、これを使ってテストすることによって、HTTPサーバーのEnd-to-Endのテストが簡単になります。
13.5.1 サーバー全体のテスト
次のようなコードがあるとします。同じ関数の中でルーター（http.Handlerインタフェース）を作ってサーバーを起動しています。これをまず分離します。
r := chi.NewRouter()
r.Get("/fortune", func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
io.WriteString(w, `{"fortune": "大吉"}`)
})
log.Println(http.ListenAndServe(Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.