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Coding Dojo:
TDD as if You Meant It
Agile Testing Days 2013

Peter Kofler, ‘Code Cop’
@codecopkofler
www.code-cop.org
Copy...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Peter Kofler
• Software Developer
for 14 years
• “fanatic about
co...
Expectations?
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Coding Dojo Mindset
●

Safe place outside
work

●

We are here to ...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Dojo Structure
●

Introduction 15'

●

Coding 30'

●

Interim (Ret...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

TDD Skills
●

Driving Development with Tests 

●

Designing Test ...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

TDD should be...
●

Add a test

●

See it fail

●

Add code to mak...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

… but often is
●

Think up design

●

Write some tests that verify...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

TDD as if You Meant It
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Rules
Exactly one, simplest failing test
●
Least code possible to ...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Assignment
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Tic-Tac-Toe
●

http://en.wikipedia.org/wiki/Tic-tac-toe

●

Board ...
Don't Focus on
Getting it Done.
F0cus on Doing
It Perfectly.
→Practice
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Closing Circle
●

What did you learn today?

●

What surprised you...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Please evaluate my presentation
using the AgileTD Mobile App at
ww...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

Peter Kofler
@codecopkofler
www.code-cop.org

Kata by

Keith Brait...
PETER KOFLER, CODE-COP.ORG

FANATIC ABOUT CODE QUALITY

CC Images
●

Dojo http://www.flickr.com/photos/49715404@N00/326762...
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TDD as if You Meant It (2013)

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Transcript of "TDD as if You Meant It (2013)"

  1. 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. 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. 3. Expectations?
  4. 4. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Coding Dojo Mindset ● Safe place outside work ● We are here to learn ● Need to slow down ● Focus on doing it right ● Collaborative Game
  5. 5. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Dojo Structure ● Introduction 15' ● Coding 30' ● Interim (Retrospective) 15' ● Break 25' ● Coding 45' ● Retrospective 15'
  6. 6. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY TDD Skills ● Driving Development with Tests  ● Designing Test Cases ● Designing Clean Code ● Refactoring Safely
  7. 7. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY TDD should be... ● Add a test ● See it fail ● Add code to make all tests pass ● Refactor mercilessly ● Repeat
  8. 8. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY … but often is ● Think up design ● Write some tests that verify the design ● Write full implementation ● Test, debug, test, debug, test, debug, … ● Add TODO to refactor later
  9. 9. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY TDD as if You Meant It
  10. 10. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Rules Exactly one, simplest failing test ● Least code possible to pass failing test ● Add code only to test methods ● When duplication is spotted ● Extract non-test methods (extract method) ● New classes only as target for “move method” ● Refactor as required ●
  11. 11. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Assignment
  12. 12. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Tic-Tac-Toe ● http://en.wikipedia.org/wiki/Tic-tac-toe ● Board 3x3 ● X plays first, O plays second ● Check if/who is winner
  13. 13. Don't Focus on Getting it Done. F0cus on Doing It Perfectly.
  14. 14. →Practice
  15. 15. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY Closing Circle ● What did you learn today? ● What surprised you today? ● What will you do differently in the future?
  16. 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. 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. 18. PETER KOFLER, CODE-COP.ORG FANATIC ABOUT CODE QUALITY CC Images ● Dojo http://www.flickr.com/photos/49715404@N00/3267627038/ ● Todos http://www.flickr.com/photos/kylesteeddesign/3724074594/ ● Signs http://www.flickr.com/photos/rwp-roger/7689114246/ ● Game http://www.flickr.com/photos/benclinch/476855843/ ● Wants you http://www.flickr.com/photos/shutter/105497713/
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