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POEmber.js property initialization explanation
 

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    <p>I'm just getting started with Ember and come across this issue while writing some jasmine tests.</p> <p>Given I have the following code</p> <pre><code>App.RecipeController = Ember.Controller.extend selectedGrain: null amount: null recipeGrains: Ember.A() totalWeight: (-&gt; weight = 0 @get('recipeGrains').forEach (grain) -&gt; weight += grain.get('weight') weight ).property('recipeGrains.@each') addGrain: -&gt; grain = Ember.Object.create name: @get('selectedGrain').get('name') weight: parseFloat(@get('amount')) @get('recipeGrains').pushObject(grain) @set('selectedGrain', null) @set('amount', null) </code></pre> <p>And I write the following test.</p> <pre><code>describe("Controllers", function() { describe("NewRecipeController", function() { var controller; beforeEach(function() { controller = Brewery.NewRecipeController.create(); }); it("calculates the correct total weight", function() { var grains = controller.get('recipeGrains'); grains.pushObject(Ember.Object.create({weight: 4.0})); grains.pushObject(Ember.Object.create({weight: 3.2})); expect(controller.get('totalWeight')).toEqual(7.2); }); it ("adds grains based on its selected grain", function() { controller.set('selectedGrain', Ember.Object.create({name: "Wheat"})); controller.set('amount', '10.2'); controller.addGrain(); expect(controller.get('totalWeight')).toEqual(10.2); }); }); }); </code></pre> <p>I expected that both tests would pass, but instead the second test fails with the message </p> <blockquote> <p>Expected 17.4 to equal 10.2.</p> </blockquote> <p>It seems the state of the first test is spilling over the the second test. Can someone more knowledgeable than I pelase explain how Ember handles controller states and why this happens?</p> <p>Thank you!</p>
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