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ASP.NET MVC, TDD, and Mock Objects

ASP.NET MVC, TDD, and Mock Objects. Josh Gough ATL ALT.NET dotnet.meetup.com/134. Sept 24, 2008: Agenda. 07:00 - 08:00: Dinner, drinks, and open discussion 08:00 - 09:30: Focused discussion: 30 min MVC+TDD+Mock Objects demo; 60 min group discussion on MVC, TDD & Mock Objects.

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ASP.NET MVC, TDD, and Mock Objects

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  1. ASP.NET MVC, TDD, and Mock Objects Josh Gough ATL ALT.NET dotnet.meetup.com/134

  2. Sept 24, 2008: Agenda • 07:00 - 08:00: Dinner, drinks, and open discussion • 08:00 - 09:30: Focused discussion: 30 min MVC+TDD+Mock Objects demo; • 60 min group discussion on MVC, TDD & Mock Objects

  3. About ATL ALT.NET We are a community of developers in Atlanta dedicated to helping each other learn and apply the best of .NET technologies. Based on the “ALT.NET” groups from http://altnetpedia.com • Calendar: http://dotnet.meetup.com/134 • Wiki: http://atlalt.net/screwturn/

  4. ASP.NET Model-View-Controller (MVC) • Much like Ruby-on-Rails, other MVC frameworks From www.asp.net/mvc: • Clear separation of concerns(Clean code model, loose coupling, high cohesion) • Testability - support for Test-Driven Development (And easy to mock dependencies) • Fine-grained control over HTML and JavaScript(works well with async and ajax) • Intuitive URLs(excellent for SEO, strong-naming of URLs)

  5. Test-Driven-Development From http://en.wikipedia.org/wiki/Test-driven_development • Requirement identified • Write an automated test • Run tests and make sure new one FAILS • Write some code • Run tests to make sure all PASS • Refactor • Repeat

  6. TDD: • Unit Test Frameworks for .NET: • NUnit • Visual Studio Test Framework • MbUnit • Pex

  7. Goals of Test Automation: xunitpatterns.com

  8. Browser and Acceptance Test Frameworks • Selenium • WatiN • FitNesse for .NET • Others?

  9. Mock Objects From http://en.wikipedia.org/wiki/Mock_object In object-oriented programming, mock objects are simulated objects that mimic the behavior of real objects in controlled ways.

  10. Good examples of using Mocks: • supplies non-deterministic results (e.g. the current time or temperature); • has states that are difficult to create or reproduce (e.g. a network error); • slow (e.g. a database which would have to be initialized before the test); • does not yet exist or may change behavior; • would have to include information and methods exclusively for testing purposes

  11. .NET Mocking Frameworks From Roy Osherove’s blog: • Rhino Mocks • Moq • NMock • EasyMock • TypeMock

  12. Popularity of MockingFrameworks

  13. Simple Demo: MVC File Processor Simple, not complete, but demonstrates: • NUnit Unit Test Suite • Mocked Http File Upload (credit: Scott Hanselman for this code) • MvcContrib SimplyRestful Routing Extension • Some adherence to SOLID design principles • Thanks for Chris Rauber, Kevin Skibbe for design ideas here, and Brian McCafferty for the S#arp architecture http://code.google.com/p/sharp-architecture/

  14. SimplyRestful Routing Automatically maps controllers to 8 standard “RESTful” routes. Keeps application focused on nouns instead of verbs/actions. Part of MvcContrib.org. Learn more at: http://abombss.com/blog/2007/12/10/ms-mvc-simply-restful-routing/ public static void RegisterRoutes(RouteCollection routes) { SimplyRestfulRouteHandler.BuildRoutes(routes); }

  15. SimplyRestful Routes

  16. Conclusion Thanks! Questions, Comments, Tips? • Learn more about ASP.NET MVC at http://www.asp.net/mvc • Notes about tonight will be on http://atlalt.net/screwturn • Completed demo solution sample will be posted on http://dotnet.meetup.com/134

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