Jest referenceError'is defined'

Question

我永远不会直接调用WebSocket，它是Asteroid的依赖。为什么Jest无法加载它？ 此外，这应该是一个默认create-react-app测试来检查应用程序“呈现没有崩溃”。但即使笑话测试说应该会崩溃，应用程序也会正常加载。

我的承诺：https://github.com/Falieson/typescript-react-asteroid-meteor/commit/ab640bee540f1f2f5da2f0fe7b4be58f75b83d28#commitcomment-23644562

> node scripts/test.js --env=jsdom --silent 

FAIL src/routes/App.test.tsx 
    ● Test suite failed to run 

    ReferenceError: WebSocket is not defined 

     at Asteroid.init (node_modules/asteroid/lib/base-mixins/ddp.js:46:67) 
     at node_modules/asteroid/lib/asteroid.js:72:33 
     at Array.forEach (native) 
     at new Asteroid (node_modules/asteroid/lib/asteroid.js:70:16) 
     at Object.<anonymous> (src/config/asteroid.ts:6:16) 
     at Object.<anonymous> (src/routes/Login.tsx:14:18) 
     at Object.<anonymous> (src/routes/App.tsx:19:15) 
     at Object.<anonymous> (src/routes/App.test.tsx:5:13) 
      at <anonymous> 
     at process._tickCallback (internal/process/next_tick.js:188:7) 

Test Suites: 1 failed, 1 total 
Tests:  0 total 
Snapshots: 0 total 
Time:  1.915s 

感谢所有帮助

Answer 1

我已经被小行星窃听了一段时间之前，我想通了，你可以指定要在构造函数中喜欢使用的WebSocket所以：

const asteroid = require('asteroid'); 
const WebSocket = require('ws'); 

const Connection = asteroid.createClass() 

const portal = new Connection({ 
    endpoint: 'ws://localhost:3000/websocket', 
    SocketConstructor: WebSocket // <-------------- HERE 
}) 

Answer 2

WebSocket类不nodejs全球存在，但在浏览器中它。测试时，您应该全局嘲笑或定义这个类。我从来没有遇到这方面的问题，但我认为你可以试试这个：

// in App.test.tsx 
const WebSocket = require('ws') 
global.WebSocket= WebSocket 

//your tests...