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If you re just getting started with unit testing, you might run into some common pitfalls. This chapter isn t meant to be an entire course on testing. There are already entire books on that, and we again recommend reading Roy Osherove s The Art of Unit Testing.
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A good controller unit test runs fast. We re talking 2,000 unit tests all running within 10 seconds. How is that possible .NET code runs quickly, so unit tests wait only for the processor and RAM. Unit tests run code only within the current application domain, so we don t have to deal with crossing application domain or process boundaries. We can quickly sabotage this fast test performance by breaking a fundamental rule of unit testing: allowing out-of-process calls. Out-of-process calls are orders of magnitude slower than in-process calls, and test performance will suffer. Ensure that you re faking out all controller dependencies, and the test will continue to run quickly.
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We also want our unit tests to be self-sufficient and isolated. Resist the temptation to refactor repeated code in unit tests and create only test helpers for the cross-cutting concerns. The DRY principle (Don t Repeat Yourself) doesn t apply to test code as much as to production code. Rather, keeping test cases isolated and self-contained reduces the change burden when the production code needs to change. Being able to scan a unit test and see the context all in one method makes them more readable. The tests should also be repeatable. That means no shared global variables for the test result state, and no shared state between tests in general. Keep unit tests isolated in every way, and they ll be repeatable, order-independent, and stable. Pay attention to pain if tests become painful and time consuming to maintain, there s something wrong. Correctly managed design and tests enable sustained speed of development, whereas poor testing techniques cause development to slow down to the point where testing is abandoned. At that point, it s back to painstaking, timeintensive manual testing. If you start to think that you could move faster without writing the tests, look for technique errors or bad design in the production code. Get a peer to review the code. Tests should enable development, not slow it down.
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In the ASP.NET MVC Framework, logic is separated into controllers and actions. Controllers are the center of an MVC presentation layer they handle all the coordination between the model and the view. Actions can accept parameters and can call for the rendering of a view. Actions aren t required to have a view, but they commonly do. When using a view, we have several methods for passing view data, and the preferred method is to use an object that suits our needs. Keep in mind that the default way of adding objects to the view data dictionary might not be best for your situation. Action parameters are matched by model binders. This leaves the action methods free to concentrate on implementing an application s storyboard. By focusing on the happy path and the alternate path, you ll find it easy to spot actions that are taking on too many branches of logic. Controllers have the potential to become just as large and convoluted as Page_Load methods in Web Forms. But a test-driven development approach and a disciplined separation of concerns can ensure the maintainability of your presentation layer.
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Learning the basic MvcContrib Grid Advanced MvcContrib Grid techniques Uploading files with SlickUpload
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The ASP.NET MVC Framework provides a lot of control over rendering HTML out of the box, but that comes at a cost. The HTML helpers are basic and provide simple user interface elements, leaving it up to you to handcraft nice UIs using HTML and CSS. Although that s a great option for an experienced web designer, most developers find relying on a third-party component to be much more productive. Doing so allows you to develop your application rather than spend lots of time on UI infrastructure. This chapter will demonstrate two third-party components that offer different styles of integrating with the MVC Framework. The first is the Grid component, available from the open source MvcContrib project, which can be used to render an HTML table. The second is the SlickUpload component for uploading large or multiple files. First let s look at the MvcContrib Grid.
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