ASP.NET MVC, TDD, and Mock Objects

Josh GoughATL 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

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/

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)

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

TDD:

Unit Test Frameworks for .NET:

•NUnit

•Visual Studio Test Framework

•MbUnit

•Pex

Goals of Test Automation: xunitpatterns.com

Browser and Acceptance Test Frameworks

Selenium WatiN FitNesse for .NET Others?

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.

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

.NET Mocking Frameworks

From Roy Osherove’s blog: Rhino Mocks Moq NMock EasyMock TypeMock

Popularity of MockingFrameworks

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/

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);

}

SimplyRestful Routes

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