TDD involves writing tests before code (red), writing just enough code to pass the test (green), then refactoring the code (refactor). The document discusses using test-driven development (TDD) and coding katas to practice TDD. It provides instructions on setting up a bowling kata in PHP using PhpSpec to learn TDD through incrementally developing tests and code for a bowling game scorekeeper class.

1. PHP Day #25
TDD
@
dj1020(at)gmail.com

2. •
• KKBOX
• Laradiner
• http://blog.dj1020.net
• dj1020(at)gmail.com

3. TDD
✦
✦
✦ (Spec)
✦ (RED) -> (GREEN)
-> (REFACTOR)

5. TDD
✦
✦ API
✦ debug
✦
✦ Procedural Programming OOP

6. Kata
✦
✦
Code
✦
✦ TDD Kata TDD

7. Kata
Kata http://www.codingdojo.org/cgi-bin/index.pl?KataCatalogue

8. Kata
✦ ( )
✦
✦ (
)
✦ TDD
✦ Editor
✦

9. Bowling Kata
✦ 10
10

10. Bowling
✦ 10 Strike 10
✦ 10 Spare
10
✦ Strike Spare

11. Bowling Kata
✦
✦ BowlingGame Class
methods
1. score()
2. roll($pins)

12. Let’s Do It

13. TDD
$ git init BowlingKata
$ cd BowlingKata
$ composer init
$ composer require phpspec/phpspec
$ ./vendor/bin/phpspec desc Twk/BowlingGame
$ ./vendor/bin/phpspec run

14. First Test
RED

15. Autoload
composer.json
{
"require": {
"phpspec/phpspec": "^2.5"
},
"autoload" : {
"psr-4" : {
“Twk" : "src/Twk"
}
}
}
$ composer dump

16. First Test
GREEN

17. Test Case 1
RED
20

18. Test Case 1
REDGREEN
20

19. Test Case 2
RED
1 20

20. Test Case 2
REDGREEN
1 20

21. Test Case 2
REDREFACTOR
DRY Extract Method

22. Test Case 2
REDREFACTOR
design

23. Test Case 3
RED
2, 8 Spare 2
10 + 2(bonus) + 2 = 14

24. Test Case 3
REDGREEN
2, 8 Spare 2
10 + 2(bonus) + 2 = 14

25. Test Case 4
RED
2, 8 Spare 2, 5
10 + 2(bonus) + 7 = 19

26. Oh Oh …
(design flaw)

27. TDD
✦
✦
✦
✦
Test Case

28. Test Case 3
RED
2, 8 Spare 2
10 + 2(bonus) + 2 = 14

29. Test Case 3
REDGREEN
2, 8 Spare 2
10 + 2(bonus) + 2 = 14

30. Test Case 4
REDGREEN
2, 8 Spare 2, 5
10 + 2(bonus) + 7 = 19

31. Test Case 4
REDGREEN
Consolidate Duplicate Conditional Fragments
REFACTOR

32. Test Case 4
REDGREEN
Rename Variables
REFACTOR

33. Test Case 4
REDGREEN
Decompose Conditional
Extract Method
REFACTOR

34. Test Case 4
REDGREEN
Extract rollSpace() method
REFACTOR

35. Test Case 5
RED
(Strike) 3, 4
10 + 3(bonus) + 4(bonus) + 7 = 24

36. Test Case 5
RED
(Strike) 3, 4
10 + 3(bonus) + 4(bonus) + 7 = 24
GREEN

37. Test Case 5
RED
Extract isStrike() method
Extract rollStrike() method
Extract spareBonus() method …
GREENREFACTOR

38. Test Case 6
RED
Perfect Game!
12 300
GREEN

39. Test Case 7
RED
9 Spare 5
… 267
GREEN

40. Test Case 8 …
Test Case
^o^

41. Q&A ?