使用QUnit和Karma测试Emberjs应用程序由于“ReferenceError：Faye未定义”而失败 [英] Testing Emberjs app using QUnit and Karma fails due to `ReferenceError: Faye is not defined`

问题描述

我正在测试EmberJs应用程序与Qunit和业力赛跑者，它的工作都很好。
然后，我不得不将faye整合到应用程序中，然后运行我的测试套件，它显示以下错误和崩溃：

ReferenceError：Faye未定义

错误被抛出，我在emberjs中定义客户端

  client = new Faye.Client（uri）; 
  

尽管这在开发，分期但不在测试中起作用。
Overhere， uri =http：// localhost：9292 / faye

faye.js包含在vendor.js（单个js文件，其中包含所有js插件，包括ember.js和ember-data.js本身），它在app.js之前加载（上面存在的文件）

解决方案

这个奇怪行为的原因与Faye中的以下行有关：

if（typeof module！=='undefined'）
module.exports = Faye;
else if（typeof window！=='undefined'）
window.Faye = Faye;

资料来源： https://github.com/faye/faye/blob/ master / javascript / faye.js＃L143

所以如果模块未定义（意思是定义），那么 module.exports 将设置对象，如果不是， window.Faye 将被设置。

如果使用调试器并在该行上设置断点，那么该模块实际上是定义，为什么？这是一个QUnit全局帮助方法！

为什么Faye这样做？我猜是因为它可以在NodeJS环境中运行（您可以阅读更多关于module.exports here ）。

如我所见，您有两种可能的解决方案：

• 在QUnit之前需要Faye。


• Patch Faye忽略窗口中模块的存在。

在使用 Teaspoon 与QUnit。

在QUnit看起来像一个坏主意之前，让Teaspoon需要Faye，而且可能会在丑陋的黑客。

我已经结束了修补Faye，使其跳过模块检查，也不是那么美丽，但我相信这是合理的。

I Was testing EmberJs application with Qunit and karma runner and it was working all good. Then I had to integrate faye into the application which went well but then on running my test suite, it shows following error and crashes:

ReferenceError: Faye is not defined

The error is thrown where, I am defining the client in emberjs

client = new Faye.Client(uri);

Though this works in development, staging but not in testing. Overhere, uri = "http://localhost:9292/faye"

faye.js is included in vendor.js(single js file which have all the js plugins including ember.js and ember-data.js itself) which is loaded before app.js(file where above line exists)

解决方案

The reason of that weird behavior is related to the following lines in Faye:

if (typeof module !== 'undefined') module.exports = Faye; else if (typeof window !== 'undefined') window.Faye = Faye;

Source: https://github.com/faye/faye/blob/master/javascript/faye.js#L143
So if module is not undefined(meaning it is defined) then module.exports will be set object, if not, window.Faye will be set.
If you use a debugger and set a breakpoint on that line you will that module is actually defined, why? it is a QUnit global helper method!
Why Faye does this? I guess because it can be run in a NodeJS environment (you can read more about module.exports here).
As I see it you have 2 possible solutions:

• Require Faye before QUnit.
• Patch Faye to ignore the existence of module in window.

I've encountered the same behavior while using Teaspoon with QUnit.
Making Teaspoon require Faye before QUnit seems like a bad idea and will be probably in ugly hack.
I've ended up with patching Faye to make it skip the module check, not so beautiful either, but I believe this is reasonable.

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