A hands-on and interactive presentation of test-driven development and pair programming.

1. Experience Agile
Programming
XP Days Ukraine
Йоханнес Бродвалл, Just-a-programmer
Стерия Норвегия
@jhannes

2. Goal
• To have fun now!
• For you to have fun now!
• For you to have fun later
(stretch goal)

3. Agenda
• Description
•Demonstration with Dima Mindra
• Discussion
• Tips and tricks

4. Description

5. Kata: Minesweeper

7. Given:
var minefield = new Minefield([
"....",
".*..",
".*.*",
"...*“ ])

8. What do watch for
• How we interact
• How we progress through the code
• How we design
• How we use the language

9. Demonstration
(Featuring Dmytro Mindra)

10. What did you see?

11. What did you see?
• How often did we switch ”driver”?
• Effects of pairing?
• What did the ”non-driver” do?

12. What did you see?
• Was the step size right?
• What was the first test?
• How did we decide next test?
• What was the final test?

13. What did you see?
• Language tricks?
• Did we refactor the right amount?
• How long was the code red?
• Strengths in final design
•Weaknesses in final design

14. Why become better at
programming?

15. Seriously. Why?

16. Only 13.37% of effort

17. Getting better quality

18. Getting better quality
Correctness
Maintainability

19. But more importantly!

20. Think better

21. Think better
Raise your level of abstraction

22. What to practice

23. Test the contract

24. Test the contract
API
Not behavior

26. Test from outside-in

27. Test from outside-in
Who?
Why?
Pop!
Mock

29. Practice pair
programming

30. Ping pong

31. Failing test
Fix the test
Failing test
Fix the test
Failing test

32. Failing test
Fix the test
Refactor
Failing test
Fix the test
Refactor
Failing test

33. Johannes Dmytro
Mikhail Sergey
Volodymyr

34. Johannes Dmytro
Mikhail Sergey
Volodymyr

35. Johannes Dmytro
Mikhail Sergey
Volodymyr

36. All-green refactoring

37. All-green refactoring
Reduce the time of uncertainty

38. How to practice

39. Practice
Practice at work
Practice katas
Practice in dojos

40. Kyiv Coding Dojo?

44. Conclusion

45. Conclusion
Free your mind

46. Free your mind
Practice our art

47. Thank you
johannes.brodwall@steria.no
http://johannesbrodwall.com
http://twitter.com/jhannes
(Please tweet in Cyrillic with
english-like words)