TypeError：environment.setup不是React Testing中的函数 [英] TypeError: environment.setup is not a function in React Testing

问题描述

我试图实现Jest网站上显示的示例：入门与Jest 。

I was trying to implement the example shown in Jest website: Getting started with Jest.

在运行 npm test 时，我收到以下错误：

While running npm test on I was getting the following error:

FAIL  src/sum.test.js
  ● Test suite failed to run

    TypeError: environment.setup is not a function

      at node_modules/jest-runner/build/run_test.js:112:23

sum.js ：

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

sum.test.js ：

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

test('adding sum function', () => {
  expect(sum(234,4)).toBe(238);
})

sum.js 和总和.test.js 是 Jest入门。

package.json ：

{
  "name": "jest-demo-test",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^16.2.0",
    "react-dom": "^16.2.0",
    "react-scripts": "1.0.17"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "jest",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "jest": "^22.0.4"
  }
}

那么，如何摆脱 TypeError：environment.setup不是函数 e rror？

So, how can I get rid of TypeError: environment.setup is not a function error?

推荐答案

Jest包含在react-scripts中。该错误是由于在使用react-scripts启动的项目中安装Jest时出现的冲突。 Jest入门指南需要一个干净的项目。

Jest is included with react-scripts. The error is due to a conflict that arose when you installed Jest in a project started with react-scripts. The "Getting started with Jest" guide expects a 'clean' project.

只需从您的（dev）依赖项中删除Jest即可。

Simply remove Jest from your (dev)dependencies and it should work.

如果你想使用Jest来测试React组件（你可能会这样做），你需要在 package.json <中修改你的测试脚本/ code>到 react-scripts test --env = jsdom ，就像它一样。

If you want to use Jest for testing React components (which you probably do), you need to modify your test script in package.json to react-scripts test --env=jsdom, as it was.

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