Many say that the practice of test driven development (TDD) has the ability to transform software engineering. Let’s break it down from a skeptical pragmatist’s viewpoint. This presentation focuses on three key ideas; the blueprint, the toolbox, and the master craft. Let’s look at TDD as a blueprint for writing code and discuss the implications and benefit. Let’s go beyond the theoretical application of TDD and focus on the toolbox, with examples of what developers need to know to get going. Finally, TDD is a master craft of Agile engineering. To be effective with TDD, let’s look at the progression of skills needed to achieve the promised results of TDD and to maximize its value. Stephen is the organizer of DC Alt.Net (http://bit.ly/ZRDxUj). He frequent speaker and trainer on many .NET topics, including automated testing, continuous integration, code analysis, and .NET best practices.Stephen is the author of the book "Pro .NET Best Practices" (http://amzn.to/v8TD8E).

1. Test Driven Development
Blueprint, Toolbox, and Master Craft
Stephen Ritchie
April 1, 2013
Stephen D. Ritchie – Managing Consultant – Excella Consulting, Inc., 2300 Wilson Blvd, Suite 630, Arlington, VA 22201 – 703.840.8600 – http://excella.com

2. Live Tweet, Slides and Examples
• Twitter: @RuthlessHelp
@Apress
• Slides:
http://www.slideshare.net/ruthlesshelp
• Code Samples:
http://github.com/ruthlesshelp
Stephen D. Ritchie 2

3. Blueprint
Stephen D. Ritchie 3

4. Toolbox
Stephen D. Ritchie 4

5. Master Craft
Stephen D. Ritchie 5

6. Motivation
Why test
software?
Stephen D. Ritchie 6

7. Motivation
Stephen D. Ritchie 7

8. Blueprint
1
Red
2
Refactor Green
3
Stephen D. Ritchie 8

9. Blueprint
0. Think
1. Write Test Code
2. Write Production Code
3. Refactor
Repeat 12–40+ cycles/hr
Stephen D. Ritchie 9

10. Blueprint
0. Think
Stephen D. Ritchie 10

11. Blueprint
1. Red
Stephen D. Ritchie 11

12. Blueprint
2. Green
Stephen D. Ritchie 12

13. Blueprint
3. Refactor
Stephen D. Ritchie 13

14. Blueprint
Repeat
Stephen D. Ritchie 14

15. Automated Tests
Make Sure
Software Works
As You Intended

16. But wait …
Stephen D. Ritchie 16

17. Temperature Conversion
Stephen D. Ritchie 17

18. Temperature Conversion
Specification By Example
Start Where You Start
Debug As You Go
Safely Refactor
Engaging (Fun?)
Stephen D. Ritchie 18

19. TDD Katas
• Bowling Score
• Roman Numerals
• Tennis Score
• Conway's Game of Life
• Kata Sites:
http://en.wikipedia.org/wiki/Kata_(programming)
Stephen D. Ritchie 19

20. But wait …
Stephen D. Ritchie 20

21. TDD: Quality, Visibility, Etc.
• Focus on Requirements
• Clear, Simple, & Testable
• Documents Code’s Behavior
• Suite of Regression Tests
• Enables & Liberates Change
• Visibility (KPI)
– Number of Passing Tests
– % Code Coverage
• Problem Prevention
Stephen D. Ritchie 21

22. But wait …
Stephen D. Ritchie 22

23. TDD: Agility
http://amzn.to/172CrtT
Stephen D. Ritchie 23

24. TDD: Agility
• Easier Debugging
• Personal Process
– Easy to Get Started
– Easy to Keep Going
• Detailed Design Do-Overs
• What Was I Thinking?
– What Was That Bozo Thinking?
• Hey, Your API Doesn’t Work
Stephen D. Ritchie 24

25. But wait …
Stephen D. Ritchie 25

26. TDD: Legacy Code
http://amzn.to/YMpZhl
Stephen D. Ritchie 26

27. TDD: Legacy Code
• Assembly Coverage
• Class Coverage
• Method Coverage
• Branch Coverage
• Boundary Analysis
• 100% Code Coverage
Stephen D. Ritchie 27

28. Toolbox
TDD Books
Stephen D. Ritchie 28

29. TDD: Big Picture
http://amzn.to/10YXE5a
Stephen D. Ritchie 29

30. TDD: The Art
http://amzn.to/XLOt4b
Second Edition:
http://bit.ly/XLOZz0
Stephen D. Ritchie 30

31. Toolbox
Testing Framework
Run Tests
Make Assertions
Stephen D. Ritchie 31

32. MSTest
- 32 -

33. MBUnit
- 33 -

34. xUnit.net
- 34 -

35. NUnit
http://www.nunit.org/
- 35 -

36. Toolbox
Mocking Framework
Isolation
Interaction Testing
Stephen D. Ritchie 36

37. Rhino Mocks
- 37 -

38. Moq
http://bit.ly/ZHjQQ0
- 38 -

39. Unit Testing
Stephen D. Ritchie 39

40. The Master Craft
Continuous Integration
Automation
Monitoring
Stephen D. Ritchie 40

41. CI Servers
Stephen D. Ritchie 41

42. CI in .NET
http://amzn.to/10mXYIt
Stephen D. Ritchie 42

43. The Master Craft
Code Coverage
Find Missing Tests
Monitoring
Stephen D. Ritchie 43

44. Toolbox
dotCover
http://www.jetbrains.com/dotcover/
Stephen D. Ritchie 44

45. Toolbox
Open Cover
http://nuget.org/packages/OpenCover
Stephen D. Ritchie 45

46. The Master Craft
http://www.ncover.com/
Stephen D. Ritchie 46

47. The Master Craft
Inversion of Control
Dependency Injection
IoC Containers
MSDN Article: http://bit.ly/172KUxg
Stephen D. Ritchie 47

48. Toolbox
Autofac
http://code.google.com/p/autofac/
Stephen D. Ritchie 48

49. The Master Craft
Stephen D. Ritchie 49

51. Of Course It’s Safe … After You

52. Shameless Self Promotion Time!
• “Best Practices” Initiative
• Tips and Tricks
• Generate Ideas
– Quantifying Value
– Biases & Aversions
– Tools & Technologies
http://amzn.to/v8TD8E
• Avoid Making the Same
Mistakes Once.
Stephen D. Ritchie 52

53. Shameless Self Promotion Time!
• 40% off eBook at
Apress.com
http://www.apress.com/9781430240235
• Use promo code:
FWUG40
• Offer expires 1-May-
2013
Stephen D. Ritchie 53

54. Stephen’s Contact Info
• Twitter: @RuthlessHelp
• Email: stephen.ritchie@excella.com
• Blog: http://ruthlesslyhelpful.net
• LinkedIn:
http://www.linkedin.com/in/sritchie
Stephen D. Ritchie 54