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    <p>Extracting interface in your scenario is a good idea. I would not worry too much about the fact that you only need this for testing. Extracting this interface makes your code decoupled from database. After that you will have a choice between writing your own implementation for testing or use mocking framework to generate this implementation for you. This is a matter of personal preference. It depends on how familiar you are with mocking framework and whether you want to spend time learning new syntax. </p> <p>In my opinion it is worth learning. It will save you a lot of typing. They are also flexible and don't always require an interface to generate test implementation. RhinoMocks for example can mock concrete classes as long they have empty constructor and methods are virtual. Another advantage is that mocking APIs use consistent naming so you will get familiar with 'Mocks', 'Stubs' etc. In your scenario by the way you need <a href="http://martinfowler.com/articles/mocksArentStubs.html" rel="nofollow">stub, not mock</a>. Writing an actual mock manually may be more labor intensive than using framework.</p> <p>The danger with mocking frameworks is that some of them are so powerful and can mock pretty much anything, including private fields (<a href="http://www.typemock.com/isolator-product-page-a" rel="nofollow">TypeMock</a>). In other words they are too forgiving to design mistakes and allow you to write very coupled code. </p> <p>This is a good <a href="http://www.markhneedham.com/blog/2010/01/15/tdd-hand-written-stubs-vs-framework-generated-stubs/" rel="nofollow">read</a> on the subject of hand written vs. generated stubs</p>
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