我对测试环境很新，比如mocha和chai，我想通过以下在线教程进行练习，但似乎它不喜欢我的工作并给我一个错误说：
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 };
我想知道任何人都有类似我的问题，并知道如何解决这个问题。由于我对这个主题并不熟悉，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! [email protected] 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 [email protected] 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! [email protected] test:watch: `npm run test -- --watch`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] 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
首先，它应该是jsdom.JSDOM。根据documentation：
Basic usage
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。
第二，JSDOM是如上所述的构造函数，因此您必须使用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其更容易：
import { JSDOM } from 'jsdom';
global.document = new JSDOM(...);
最后，使用window而不是新API中不存在的defaultView。它返回undefined，这就是jQuery无法工作的原因：
const $ = jquery(global.document.window);
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。