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    copied!<blockquote> <p>Is this a best-practice for application wide variable usage?</p> </blockquote> <p>Best practice is a bit of a subjective notion and without fully explaining your scenario and what precisely are you trying to achieve I prefer not to discuss it.</p> <p>We cannot discuss whether this is best practice but from what I can see it is not wrong either. It is not wrong because you are using the abstractions allowing the code to be unit tested.</p> <blockquote> <p>In the unit test, how can I add the application level variables the controller needs?</p> </blockquote> <p>You could use a mocking framework such as Rhino Mocks to mock the abstractions that the controller needs. Let's take as an example the following controller:</p> <pre><code>public class HomeController : Controller { public ActionResult Index() { var myVar = (MyVar)HttpContext.Application["MyVar"]; return Content(myVar.Foo); } } </code></pre> <p>and we would like to unit test the Index action. Here's a sample unit test:</p> <pre><code>[TestMethod] public void Index_Action_Should_Retrieve_MyVal_From_AppState() { // arrange var target = new HomeController(); var httpContext = MockRepository.GeneratePartialMock&lt;HttpContextBase&gt;(); var application = MockRepository.GeneratePartialMock&lt;HttpApplicationStateBase&gt;(); application.Expect(x =&gt; x["MyVar"]).Return(new MyVar { Foo = "bar" }); httpContext.Expect(x =&gt; x.Application).Return(application); target.ControllerContext = new ControllerContext(httpContext, new RouteData(), target); // act var actual = target.Index() as ContentResult; // assert Assert.AreEqual("bar", actual.Content); } </code></pre>
 

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