Jest

安装Jest

npm install --save-dev jest

创建文件︰

sum.js

function sum(a, b) {
  return a + b;
}
module.exports = sum;

sum.test.js

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

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

配置

package.json

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

运行

yarn test

结果

PASS  ./sum.test.js
✓ adds 1 + 2 to equal 3 (5ms)