Testing events in XMLHttpRequest ... what am I doing wrong?

[Matěj Cepl]

Hi,

I am trying to test for the bad path of my XMLHttpRequest (plain
JavaScript one, not any library) processing function with jasmine, and
the best I can think about is this:

describe("LoadFeed", function() {
beforeEach(function() {
spyOn(XMLHttpRequest.prototype, 'open').andCallThrough();
spyOn(XMLHttpRequest.prototype, 'send');
});

// ...

it("should fail when XMLHttpRequest fails", function() {
spyOn(XMLHttpRequest.prototype, 'onerror').andCallThrough();
spyOn(XMLHttpRequest.prototype,
'onload').andCallFake(function(evt) {
var new_event = document.createEvent("ProgressEvents");
new_event.initProgressEvent("error", evt.canBubble,
evt.cancelable, evt.lengthComputable, evt.loaded,
evt.lengthComputable);
evt.target.dispatchEvent(new_event);

podcast.load_feed(URL_FEED);
expect(XMLHttpRequest.prototype.onerror).toHaveBeenCalled();
});
});

However, when I try to run this I get this error:

TypeError: Value does not implement interface
XMLHttpRequestEventTarget. in
file:///home/matej/projekty/elasmotherium/wsgi\
/static/spec/lib/jasmine.js (line 2415)

Any idea, how to do it right?

Thanks for any response,

Matěj

--
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[Davis W. Frank]

XMLHttpRequest is a bit of a special beast.

Check out the jasmine-ajax add-on: http://github.com/pivotal/jasmine-ajax for a better fake for HTTP.

--dwf

--
thx,

--dwf

[Ben Loveridge]

If you are not using jQuery, another tool that works very well is sinon.js. It functions at a level lower than libraries and lets you easily provide fabricated responses for any combination of URLs, methods, etc.
-- 

Ben Loveridge 

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[JR Boyens]

Version 2.0 of jasmine-ajax supports mocking XMLHttpRequest directly and removes the jQuery requirement.

2.0 has some features that are not yet complete, but mocking should work just fine. Find it in the 2_0 branch of jasmine-ajax.