Test Driven Development: Blueprint, Toolbox, and Master Craft

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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).

Technologie

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

Live Tweet, Slides and Examples

• Twitter: @RuthlessHelp
@Apress

• Slides:
http://www.slideshare.net/ruthlesshelp

• Code Samples:
http://github.com/ruthlesshelp
Stephen D. Ritchie 2

Motivation

Why test
software?
Stephen D. Ritchie 6

Blueprint

1

Red

2

Refactor Green
3

Stephen D. Ritchie 8

Blueprint

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

Blueprint

0. Think

Stephen D. Ritchie 10

Blueprint

1. Red

Stephen D. Ritchie 11

Blueprint

2. Green

Stephen D. Ritchie 12

Blueprint

3. Refactor

Stephen D. Ritchie 13

Blueprint

Repeat

Stephen D. Ritchie 14

Automated Tests
Make Sure
Software Works
As You Intended

Temperature Conversion

Stephen D. Ritchie 17

Temperature Conversion

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

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

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

TDD: Agility

http://amzn.to/172CrtT

Stephen D. Ritchie 23

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

TDD: Legacy Code

http://amzn.to/YMpZhl

Stephen D. Ritchie 26

TDD: Legacy Code

• Assembly Coverage
• Class Coverage
• Method Coverage
• Branch Coverage
• Boundary Analysis
• 100% Code Coverage

Stephen D. Ritchie 27

Toolbox

TDD Books

Stephen D. Ritchie 28

TDD: Big Picture

http://amzn.to/10YXE5a

Stephen D. Ritchie 29

TDD: The Art

http://amzn.to/XLOt4b

Second Edition:
http://bit.ly/XLOZz0

Stephen D. Ritchie 30

Toolbox

Testing Framework

Run Tests
Make Assertions
Stephen D. Ritchie 31

Toolbox

Mocking Framework

Isolation
Interaction Testing
Stephen D. Ritchie 36

The Master Craft

Continuous Integration

Automation
Monitoring
Stephen D. Ritchie 40

CI in .NET

http://amzn.to/10mXYIt

Stephen D. Ritchie 42

The Master Craft

Code Coverage

Find Missing Tests
Monitoring
Stephen D. Ritchie 43

Toolbox

dotCover

http://www.jetbrains.com/dotcover/

Stephen D. Ritchie 44

Toolbox

Open Cover

http://nuget.org/packages/OpenCover

Stephen D. Ritchie 45

The Master Craft

http://www.ncover.com/

Stephen D. Ritchie 46

The Master Craft

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

Toolbox

Autofac

http://code.google.com/p/autofac/

Stephen D. Ritchie 48

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

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

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

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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

50.

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

Notes de l'éditeur

Testing FrameworkMSTest
Testing FrameworkMbUnit
Testing FrameworkxUnit.net
Testing FrameworkNUnit
Mocking FrameworkRhinoMocks
Mocking FrameworkMoq

Test Driven Development: Blueprint, Toolbox, and Master Craft

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