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POQUnit, Sinon.js & Backbone unit test frustration: sinon spy appears to fail to detect Backbone Model event callbacks
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10865364
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10865577
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1
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0
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2012-06-02T19:39:21.817
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6
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2012-06-02T22:26:32.010
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2012-06-02T22:06:08.780
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652693
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652693
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0
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1
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6
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3618
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text
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In the following unit test code: <pre><code>TestModel = Backbone.Model.extend({ defaults: { 'selection': null }, initialize: function() { this.on('change:selection', this.doSomething); }, doSomething: function() { console.log("Something has been done."); } }); module("Test", { setup: function() { this.testModel = new TestModel(); } }); test("intra-model event bindings", function() { this.spy(this.testModel, 'doSomething'); ok(!this.testModel.doSomething.called); this.testModel.doSomething(); ok(this.testModel.doSomething.calledOnce); this.testModel.set('selection','something new'); ok(this.testModel.doSomething.calledTwice); //this test should past, but fails. Console shows two "Something has been done" logs. }); </code></pre> The third ok fails, even though the function was effectively called from the backbone event binding, as demo'd by the console. <img src="https://i.stack.imgur.com/UMUhR.png" alt="3rd test fails"> <img src="https://i.stack.imgur.com/AzTsm.png" alt="enter image description here"> This is very frustrating and has shaken my confidence on whether sinon.js is suitable for testing my backbone app. Am I doing something wrong, or is this a problem with how sinon detects whether something has been called? Is there a workaround? EDIT: Here's a solution to my specific example, based on the monkey patch method of the accepted answer. While its a few lines of extra setup code in the test itself, (I don't need the module function any more) it gets the job done. Thanks, <code>mu is too short</code> <pre><code>test("intra-model event bindings", function() { var that = this; var init = TestModel.prototype.initialize; TestModel.prototype.initialize = function() { that.spy(this, 'doSomething'); init.call(this); }; this.testModel = new TestModel(); . . . // tests pass! }); </code></pre>
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<javascript><backbone.js><qunit><sinon>
Title
QUnit, Sinon.js & Backbone unit test frustration: sinon spy appears to fail to detect Backbone Model event callbacks
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