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POHow can unit tests be modular when they are dependant on other units?
 

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  1. POHow can unit tests be modular when they are dependant on other units?
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    <p>I am trying to retrospectively unit test an application that is fairly complex but utilises MVC. I know retrospectively applying unit tests isn't ideal but I still believe it's possible by refactoring existing code. A majority of the time it is not possible to unit test one unit, without relying on other units i.e. a view relies on a model. </p> <p>What is the best way to unit test in this case? Is it better to utilise the real model or create a mock model?</p> <p>The problem with utilising a real model in my situation is that the model relies on other response classes that get data from XML so there's a chain of reliance. This model has a lot of data so it would be much easier to use this but maybe I'm missing the point.</p> <p>I have provided a UML of the application for brevity.</p> <p><img src="https://i.stack.imgur.com/mlw8C.jpg" alt="enter image description here"></p> <p>**Edit ****</p> <p>Ok so if I am correct, is it best practice to create mock data inside a mock class? for example I have the mock class "MockPlaylistPanelModel" that creates data required for the View class "PlaylistPanel" to run without errors:</p> <pre><code>class MockPlaylistPanelModel extends Mock implements IPlaylistPanelModel { /** * Return all playlist items * @public */ public function get mainPlaylistItems():Vector.&lt;PlaylistData&gt; { var playData:Vector.&lt;PlaylistData&gt; = new Vector.&lt;PlaylistData&gt;; var playlistResp:PlaylistData = new PlaylistData(0, "", "", 0, 0, 0, 0); playData.push(playlistResp); return playData; } } </code></pre>
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