JSDOM 和 jQuery 不能一起工作

Question

我对 mocha 和 chai 等测试环境还很陌生，我想按照在线教程进行练习，但它似乎不喜欢我所做的并且给我一个错误提示：

global.document = _jsdom2.default.jsdom('<!doctype html><html><body></body></html>');
                                  ^
TypeError: _jsdom2.default.jsdom is not a function

我的test_helper 看起来像，

import jsdom from 'jsdom';
import jquery from 'jquery';
import TestUtils from 'react-dom/test-utils';
import ReactDOM from 'react-dom';
import chai, { expect } from 'chai';
import React from 'react';
import { Provider } from 'react-redux';
import { createStore } from 'redux';
import reducers from '../src/reducers';
import chaiJquery from 'chai-jquery';

// Set up testing environment to run like a browser in the command line
global.document = jsdom.jsdom('<!doctype html><html><body></body></html>');
global.window = global.document.defaultView;

const $ = jquery(global.window);

// Build 'renderComponent' helper that should render a given react class
function renderComponent(ComponentClass, props, state) {
  const componentInstance = TestUtils.renderIntoDocument(
    <Provider store={createStore(reducers,state)}>
      <ComponentClass {...props}/>
    </Provider>
  );

  return $(ReactDOM.findDOMNode(componentInstance)); // produces HTML
}
// Build helper for simulating(or other) event

// Set up chai-jquery
chaiJquery(chai, chai.util, $);

export default { renderComponent, expect };

我想知道有没有人和我一样有类似的问题并且知道如何解决这个问题。由于我对这个主题不是很熟悉，所以我不确定如何调试它。

---

这是我实现const { JSDOM } = jsdom;和new JSDOM(...)后的错误堆栈

    if ( !w.document ) {
                       ^

TypeError: Cannot read property 'document' of undefined
    at module.exports (/Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/node_modules/jquery/dist/jquery.js:30:12)
    at Object.<anonymous> (/Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/test/test_helper.js:17:11)
    at Module._compile (module.js:571:32)
    at loader (/Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/node_modules/babel-register/lib/node.js:144:5)
    at Object.require.extensions.(anonymous function) [as .js] (/Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/node_modules/babel-register/lib/node.js:154:7)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at /Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/node_modules/mocha/bin/_mocha:355:3
    at Array.forEach (native)
    at Object.<anonymous> (/Users/cheewoonkim/Desktop/nodeapp/meanmapsapp/node_modules/mocha/bin/_mocha:354:10)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:423:7)
    at startup (bootstrap_node.js:147:9)
    at bootstrap_node.js:538:3
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! budee_order_tracking@1.0.0 test: `mocha --compilers js:babel-core/register --require ./test/test_helper.js --recursive ./test "--watch"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the budee_order_tracking@1.0.0 test script 'mocha --compilers js:babel-core/register --require ./test/test_helper.js --recursive ./test "--watch"'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the budee_order_tracking package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     mocha --compilers js:babel-core/register --require ./test/test_helper.js --recursive ./test "--watch"
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs budee_order_tracking
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls budee_order_tracking
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/cheewoonkim/.npm/_logs/2017-05-16T01_20_20_200Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! budee_order_tracking@1.0.0 test:watch: `npm run test -- --watch`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the budee_order_tracking@1.0.0 test:watch script 'npm run test -- --watch'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the budee_order_tracking package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run test -- --watch
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs budee_order_tracking
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls budee_order_tracking
npm ERR! There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/cheewoonkim/.npm/_logs/2017-05-16T01_20_20_215Z-debug.log 

Answer 1

不同的语法：

import jsdom from "jsdom";
import chai from "chai";
//...

global.doc = new jsdom.JSDOM("...");
global.window = doc.window;

new 运算符在这里很重要，因为没有它就无法调用 JSDOM。

Answer 2

首先应该是jsdom.JSDOM。根据documentation：

基本用法

const jsdom = require("jsdom");
const { JSDOM } = jsdom;

要使用jsdom，您将主要使用JSDOM 构造函数，它是jsdom 主模块的命名导出。

其次，JSDOM是一个构造函数如上所述，所以你必须使用new关键字：

import jsdom from 'jsdom';

global.document = new jsdom.JSDOM(...);

我会使用命名导入来导入特定的命名导出以使这更容易：

import { JSDOM } from 'jsdom';

global.document = new JSDOM(...);

最后，使用window 代替defaultView，defaultView 在新 API 中不存在。它返回 undefined，这就是 jQuery 不起作用的原因：

const $ = jquery(global.document.window);