用Jest测试ES6模块 [英] Test ES6 modules with Jest

问题描述

如何使用Jest测试ES6模块.

How to test ES6 modules with Jest.

示例:

sum.js

const sum = function (a, b) {
  return a + b;
}

export default sum;

sum.test.js

import sum from './sum';

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

推荐答案

唯一的要求是将您的test环境配置为Babel，并添加es2015转换插件:

The only requirement is to config your test environment to Babel, and add the es2015 transform plugin:

第1步:

将test环境添加到项目根目录中的.babelrc:

Add your test environment to .babelrc in the root of your project:

{
  "env": {
    "test": {
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}

第2步:

安装es2015转换插件:

Install the es2015 transform plugin:

npm install --save-dev babel-plugin-transform-es2015-modules-commonjs

---

就是这样. Jest将自动启用从ES模块到CommonJS的编译，而不必在package.json中的jest属性中通知其他选项.

---

And that's it. Jest will enable compilation from ES modules to CommonJS automatically, without having to inform additional options to your jest property inside package.json.

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