【node.js】jestを使って単体テストできるまでの手順
Posted: 2020-05-17
スポンサーリンク
目次
背景
私は元々サーバエンジニアですが、一応railsやpythonの開発経験はあり、ちゃんと動くコードを書くことは一応できます。
そんな私の自己評価としてプロのプログラマーと一番大きな差は テストをしっかり行うこと(そのための経験や考え方) だと考えています。(要するに正常系しかテストしてない)
ということで、やや話は飛びますが今回はnode.jsで単体テストを実行できるようにするまでの手順をメモします。
今回使うモジュール
jest というモジュールを使います。 nodejs 単体テスト などでググると色々な記事が出てきましたが、このjestが一番良さそうだと感じました。
- reactのテストに向いている(どちらもfacebookが開発)
- モックも使える
- カバレッジを出せる
※他のでもできるんだとは思いますが、使い勝手が良さそうだったのと記事が多そうだったので。
インストール手順
npmでインストールします。
$ npm install --save-dev jest
以下のような結果が帰ってくればOK。
npm WARN blog@1.0.0 No description
+ jest@26.0.1
added 300 packages from 184 contributors and audited 991 packages in 27.705s
テストするコードとテストされるコードの準備
今回テストされるコードはこちら
// hello.js
module.exports = function() {
return "hello world";
};
テストするコードはこちら
// hello.test.js
const hello = require("./hello.js");
test("check hello", () => {
expect(hello()).toBe("hello world");
});
package.jsonにテストを追記
package.jsonにテスト用のスクリプトの記述を追加します。
"scripts": {
"test": "jest" //ここを追記
},
これで準備はOK。
テストの実行
では実際にテストを行ってみます。
$ npm run test
以下のような結果が帰ってくればOKです。
> blog@1.0.0 test
> jest
PASS ./hello.test.js
✓ check hello (4 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 2.546 s
Ran all test suites.
以上となります。
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