1. unit testing, ui testing, & test-
driven development in visual
studio 2012
Jon Limjap
C# MVP

2. Agenda
• Overview of Unit Testing, UI Testing and
Test Driven Development
• Unit testing UI and code in Visual Studio
2012

3. what’s up with all these tests?
overview of unit testing, ui
testing, and test driven
development

4. Let’s talk about unit testing
• What is Unit Testing?
• What is UI Testing?
• What is Test Driven Development?

5. What is a unit test?
• Code that test a single unit of functionality
(obviously!)
• A single unit is any block of code that has
ONE and only ONE responsibility:
– Method
– Function
– Class

6. What is User Interface Testing?
 Using unit tests to validate user
interaction
 Automates user actions: clicking and
typing
 Automated UI tests allow your machine to
do repetitive tasks across an application’s
interface for you ;)

7. What is Test Driven
Development?
 Using unit tests to design software
 Allows change in code without fear of
changing functionality
 Produces loosely coupled objects and
methods with single responsibilities
 Unit tests become a tool to guide code
design

8. Red Green Refactor

9. red
 New code
 Write test before implementing class
 Internal workings of classes and methods
should not matter
 Existing code
 Write test to reproduce bug

10. green
 Write least possible code to pass all tests
 Take shortcuts if necessary

11. refactor
 Refactor both implementation code and
test code
 Change code without fear – you have
automated tests!
 Remove implementation shortcuts – make
sure software design makes sense
 Optimize for
design/performance/maintainability

12. rinse and repeat!

13. Customer feedback on MS Test
• MS Test Framework Issues
– MS-Test too slow
– MS-Test missing new features
• Experience Issues
– Designed for testers and not for developers
– Not good for Agile & TDD

14. what’s new
unit testing in
visual studio 2012

15. The Visual Studio 2012 Unit
Testing experience is
focused on developers
writing and running unit tests
while they write their code.

16. Yey new features!
• Developer focused user experience
• MS-Test improvements
• Built-in and Third-party test frameworks
• Continuous Testing
• Debug Selected Tests
• Code Coverage

17. Developer Focused User Experience

18. MS-Test Improvements
• Many performance and scale improvements
– Especially when you stick to “classic” unit testing
• Support for testing Async
[TestMethod]
public async Task MyAsyncTest()
{
var result = await SomeLongRunningOperation();
Assert.IsTrue( result );
}
• Proper support for 64-bit and .Net multi-targeting
• Available in Express!

19. Supported Test Frameworks
• Built-in
– .NET
– Native C/C++
• Third-party
– NUnit
– xUnit.net
– MbUnit
– QUnit/Jasmine
– Selenium

20. some ui testing in the web
ui testing with nunit, selenium
and visual studio 2012

21. Red Green Refactor

22. some genuine test driven development
test driven development
with nunit and visual
studio 2012

23. Continuous Testing
• If you’re not testing you’re just compiling,
not building
• Make sure you don’t break your code and
tests – everytime you build!

24. Code Coverage
• Analyze your code
coverage with a single
click
• Analyze for selected
tests to help find how
specific tests are
covering your system
• Supports all managed
& native frameworks

25. Non C# unit testing coolness
• Unit Testing Browser-based Javascript
(via Qunit/Jasmine)
• Unit Testing Native C++ Applications

26. let’s see it!
demo

27. Just contact maybe :p
• twitter.com/lattex
• jonlimjap@gmail.com
• dotnet.kapenilattex.com

28. References
• Peter Provost:
http://channel9.msdn.com/Events/TechEd/Europe/
2012/DEV214?format=html5
• Jason Zander:
http://blogs.msdn.com/b/jasonz/archive/2012/05/
22/my-favorite-features-unit-testing-
enhancements-in-visual-studio-11.aspx
• Ben Hall:
http://blog.benhall.me.uk/2008/05/nxtgenug-
coventry-red-green-refactor.html
• Anoop Shetty:
http://anoopjshetty.wordpress.com/2012/02/08/cr
eating-test-automation-framework-using-c-