问题
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)
回答1:
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.
来源：https://stackoverflow.com/questions/27243632/testing-emberjs-app-using-qunit-and-karma-fails-due-to-referenceerror-faye-is