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Jestの使い方メモ

Last updated at Posted at 2023-03-07

Jestのインストール方法

npm install --save-dev jest

まずは、テストするための処理を関数として記述する。

// sum.js
function sum(a, b) {
  return a + b;
}

module.exports = sum;

テストケースを用意する。

// sum.test.js
const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
})
test('adds 23 + 45 to equal 68', () => {
  expect(sum(23, 45)).toBe(68);
})

package.jsonに以下を追加する。

"scripts": {
  "test": "jest",
}

テストを実行する。

npm test

テストに成功すると以下のように出力される。

PASS  src/sum.test.js
  ✓ adds 1 + 2 to equal 3 (2 ms)
  ✓ adds 23 + 45 to equal 68

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        0.502 s
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