A brief introduction on how to write a WPF/MVM application in Test Driven Development

1. Test Driving a MVVM app Emanuele DelBono emanuele@codiceplastico.com http://blog.codiceplastico.com/ema Twitter @emadb

2. Who I am Dev in CodicePlastico C#WPF/ASP.NET MVC Ruby/Ruby on Rails TDD passionate UgiALT.NET founder Speaker/blogger

3. Agenda Very short intro to TDD 2 pomodori of live coding Q&A&Discussion

4. Prerequisites MVVM pattern Testing framework Test doubles (Mock/Stub)

5. Doubts?

6. MVVM in one slide View textbox button Properties listbox Commands ViewModel Model

7. Testing Frameworks An xUnit tool to Minimize effort in writing tests Simplify the running phase Usually is an assembly to reference in your test projects, with: A bunch of attributes to mark the test methods A bunch of asserts to verify your expectations

8. Test doubles To keep the focus on the tested object we need to remove all the dependencies Test doubles act as “fake” dependencies that replace the real ones Frameworks like Moq, RhinoMock, etc…came to help

9. TDD Test Driven Development / Test Driven Design A design practice 3 simple rules Write no production code without failing tests Write only enough test code so that it fails Write only enough production code to get your tests to pass Robert (uncle bob) Martin

10. Sample App A simple Todo list manager When the app starts I want see the to do list I want to be able to add a new Item specifing a description and a due date I want to be able to delete an item I want to be able to mark an item as complete

11. Tools Visual Studio 2010 / Expression Blend Resharper xUnit + xUnitContrib Moq Pomodoro

12. First step

13. Let’s Code

14. Thanks References: Growing object oriented software – Freeman, Pryce – Addison Wesley The art of Unit Testing – RoyOsherove - Manning http://xunitpatterns.com/ http://www.mockobjects.com/ Code http://wpftodolist.googlecode.com

15. …un ultimacosa… 12 e 13 Giugno …ricordatevidei referendum 