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POTesting initialization logic in closure in angular service
 

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    <p>I have an angular service that is used as a factory function to instatiate many object instances of the type Engine like this:</p> <pre><code>angular.module('parts.engine', []).factory('Engine', function() { var Engine = function( settings ) { this.hp = settings.engine.hp; this.miles = 0; }; Engine.prototype.setMiles = function( miles ) { this.miles = miles; } return Engine; }); </code></pre> <p>Say I have another angular service, that is also used to create instances of an object like this:</p> <pre><code>angular.module('car', ['parts.engine']).factory('carCreator', function( Engine ) { var carCreator = function( settings ) { var engine = new Engine( settings ); engine.setMiles( settings.engine.miles ) return { brand: settings.brand; engine: engine; } }; return carCreator; }); </code></pre> <p>So I now instatiate a new instance of a car object like this:</p> <pre><code>angular.module('carApp', ['car']).controller('AppCtrl', function( carCreator ) { var settings = { brand: 'Ford', engine: { hp: 125, miles: 12000 } }; var newCar = carCreator(settings); }); </code></pre> <p>Does anyone have an idea how to test the initialization logic:</p> <pre><code>var engine = new Engine( settings ); engine.setMiles( settings.engine.miles ) </code></pre> <p>in the carCreator factory? I know I can instantiate an object with the carCreator class and check, if the returned objects <code>engine.miles</code> property is set to the correct value. But I have cases, where checking for this will not be as easy, because the initalization logic and the values returned are much more complex. What I would like to do is test the businesslogic of <code>setMiles</code> in the Engine class, and just setup a SpyOn on <code>Engine</code> and <code>engine.setMiles</code> when testing the carCreator class, but how do I do that, when <code>engine</code> is created in the closure? </p>
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