The document summarizes Peter Kofler's presentation on Test Driven Development (TDD) at Agile Testing Days 2013. It discusses the mindset of TDD coding dojos, the structure of Kofler's dojo sessions, skills practiced in TDD like designing test cases and refactoring, rules for "TDD as if you meant it," and an assignment to implement tic-tac-toe using TDD. The goal is to focus on doing TDD perfectly rather than just getting the implementation done.

1. Coding Dojo:
TDD as if You Meant It
Agile Testing Days 2013
Peter Kofler, ‘Code Cop’
@codecopkofler
www.code-cop.org
Copyright Peter Kofler, licensed under CC-BY.

2. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Peter Kofler
• Software Developer
for 14 years
• “fanatic about
code quality”
• I help development teams to do it right
• Pair Programming #CodeCopTour

3. Expectations?

4. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Coding Dojo Mindset
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Safe place outside
work
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We are here to learn
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Need to slow down
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Focus on doing it right
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Collaborative Game

5. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Dojo Structure
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Introduction 15'
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Coding 30'
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Interim (Retrospective) 15'
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Break 25'
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Coding 45'
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Retrospective 15'

6. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
TDD Skills
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Driving Development with Tests 
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Designing Test Cases
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Designing Clean Code
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Refactoring Safely

7. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
TDD should be...
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Add a test
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See it fail
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Add code to make all tests pass
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Refactor mercilessly
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Repeat

8. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
… but often is
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Think up design
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Write some tests that verify the design
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Write full implementation
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Test, debug, test, debug, test, debug, …
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Add TODO to refactor later

9. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
TDD as if You Meant It

10. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Rules
Exactly one, simplest failing test
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Least code possible to pass failing test
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Add code only to test methods
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When duplication is spotted
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Extract non-test methods (extract method)
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New classes only as target for “move method”
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Refactor as required
●

11. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Assignment

12. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Tic-Tac-Toe
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http://en.wikipedia.org/wiki/Tic-tac-toe
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Board 3x3
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X plays first, O plays second
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Check if/who is winner

13. Don't Focus on
Getting it Done.
F0cus on Doing
It Perfectly.

14. →Practice

15. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Closing Circle
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What did you learn today?
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What surprised you today?
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What will you do
differently in the
future?

16. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Please evaluate my presentation
using the AgileTD Mobile App at
www.touchmyconference.com/ATD2013
I appreciate your feedback.

17. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
Peter Kofler
@codecopkofler
www.code-cop.org
Kata by
Keith Braithwaite
@keithb_b
http://cumulative-hypotheses.org/2011/08/30/tdd-as-if-you-meant-it/

18. PETER KOFLER, CODE-COP.ORG
FANATIC ABOUT CODE QUALITY
CC Images
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Dojo http://www.flickr.com/photos/49715404@N00/3267627038/
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Todos http://www.flickr.com/photos/kylesteeddesign/3724074594/
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Signs http://www.flickr.com/photos/rwp-roger/7689114246/
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Game http://www.flickr.com/photos/benclinch/476855843/
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Wants you http://www.flickr.com/photos/shutter/105497713/