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问题描述

我已经在我的react项目中安装了jest和jsdom,但是在导入使用window.localStorage变量的react组件时遇到了问题.我为jsdom添加了一个设置文件,我相信它将解决该问题.

I have installed jest and jsdom into my react project but I am having problems with importing a react component that uses the window.localStorage variable. I have added a setup file for jsdom that I believed would solve the problem.

这是我的设置:

jest配置

"jest": {
    "verbose": true,
    "testEnvironment": "jsdom",
    "testURL": "http://localhost:8080/Dashboard/index.html",
    "transform": {
      "^.+\\.js$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.jsx$": "<rootDir>/node_modules/babel-jest"
    },
    "unmockedModulePathPatterns": [
      "node_modules/react/",
    ],
    "moduleFileExtensions": [
      "js",
      "jsx",
      "json",
      "es6"
    ]
  }

setup.js

import jsdom from 'jsdom';

const DEFAULT_HTML = '<html><body></body></html>';

global.document = jsdom.jsdom(DEFAULT_HTML);

global.window = document.defaultView;
global.navigator = window.navigator;
global.localStorage = window.localStorage;

test.js

'use strict';
import setup from './setup';
import React from 'react';
import jsdom from 'jsdom';
import Reportlet from '../components/Reportlet.jsx';

it('Ensures the react component renders', () => {

});

我的reportlet组件使用localStorage变量,但大喊:

My reportlet component uses the localStorage variable but yells:

Cannot read property getItem of undefined当我呼叫localStorage.getItem(<some item>)

我在此处读到,jest与jsdom一起提供但是我不确定是否需要额外的jsdom依赖关系.我还阅读了此处,需要先加载jsdom,然后才需要对第一个做出反应时间.

I read here that jest comes shipped with jsdom but I am not sure if I need the extra jsdom dependency or not. I also read here that jsdom needs to be loaded before requiring react for the first time.

有人知道如何正确地用jsdom配置玩笑吗?

Does anyone know how to configure jest with jsdom correctly?

推荐答案

jsdom不支持localStorage.看起来您可以使用"node-localstorage"之类的节点友好型存根.请参见 https://github.com/tmpvar/jsdom/issues/1137

jsdom does not support localStorage. It looks like you can use a node-friendly stub like 'node-localstorage'. See bottom of comments at https://github.com/tmpvar/jsdom/issues/1137

...或者您可以使用 https://github之类的东西来模拟它. com/letsrock-today/mock-local-storage

...or you can mock it with something like https://github.com/letsrock-today/mock-local-storage

...或像下面这样滚动自己的模拟程序:如何在JavaScript单元测试中模拟localStorage?

...or roll your own mock like seen here: How to mock localStorage in JavaScript unit tests?

这篇关于我如何用玩笑配置jsdom的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

09-09 13:21