Test, transform, refactor

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Let's have a close look into the Red-Green-Refactor cycle and understand the subtleties of each step. When we go down the rabbit hole of Test Driven Design we sometimes take too big steps leading us to many failed tests we just can bring back to green without writing a lot of code. We need to take a step back and take the shrinking potion of baby steps again. This very illustrative talk, full of test and code examples, will dig into each of the steps of TDD to help you understand how to keep a sustainable pace that will lead you in the right track.

Technology

TEST,
Test,
Test,
Test,
Test,

TRANSFORM,
Transform,
Transform,

Transform,
REFACTOR

Refactor
Refactor
Refactor
Refactor

PHPUK 2014

by @_md

Learning

@_md

Marcello Duarte
Lead developer
Head of Training
Kata sensei

@_md

Marcello Duarte
Lead developer
Head of Training

20 minutes
throw away
TDD
refactor

Kata

no code without test

TDD

3Rules

enough to go red
enough to go green

no code without test
Test

enough to go red

Code

enough to go green

Refactor

tests run and pass
dry
sign remove opacity
De
ple
Sim
simplify

4Rules

Converting arabic numbers into their
roman equivalent
!

e.g. 2149 => MMCXLIX

Test

Make it red

Code

Make it green

Refactor

Make it right

Test

Make it more specific

Transform

Make it more generic

Refactor

Put on the design hat

null to constant
constant to constant+
constant to scalar
statement to statements
unconditional to if
if to while

Transformations (just the most basic ones)

* in PHP
http://www.ﬂickr.com/photos/jorendegroof/4471189540/

Jim Weirich’s Roman Numeral Kata*

Condition to loop transformation
!

is a great indicator you are in the
right track of solving the algorithm
[Martin 13]

Kata
Deliberate Practice

Koan
Deliberate Learning

• Optimising for performance • Optimising for discovery
• Minimising variance
• Maximising variance

[North 12]

Learning TDD is learning
all that TDD does for you

“The beauty of a move lies not in its'
appearance but in the thought behind it.”

My System
elements of chess
positional play
illustrative games

First learn the elements of design
Then learn how to drive it with test

Marcello Duarte
we are hiring
try phpspec!
follow @_md

Questions or Comments?
joind.in/10711

@_md

want to learn more? inviqa.com/tdd-immersion-day/

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Test, transform, refactor

1. TEST, Test, Test, Test, Test, TRANSFORM, Transform, Transform, Transform, REFACTOR Refactor Refactor Refactor Refactor PHPUK 2014 by @_md

2. Learning @_md Marcello Duarte Lead developer Head of Training Kata sensei

3. @_md Marcello Duarte Lead developer Head of Training

4. Kata form movement practice deliberate

5. 20 minutes throw away TDD refactor Kata

6. Test Refactor Code

7. no code without test TDD 3Rules enough to go red enough to go green

8. no code without test Test enough to go red Code enough to go green

9. Refactor tests run and pass dry sign remove opacity De ple Sim simplify 4Rules

10. The Roman Numerals Kata

11. Converting arabic numbers into their roman equivalent ! e.g. 2149 => MMCXLIX

12. Test Make it red Code Make it green Refactor Make it right

13. The Roman Numerals Kata gone wrong demo

14. Introducing TPP

15. Test Make it more specific Transform Make it more generic Refactor Put on the design hat

16. null to constant constant to constant+ constant to scalar statement to statements unconditional to if if to while Transformations (just the most basic ones)

17. * in PHP http://www.ﬂickr.com/photos/jorendegroof/4471189540/ Jim Weirich’s Roman Numeral Kata*

18.

19.

20. Walking skeleton [Cockburn 94]

21.

22.

23.

24. Transformation null -> constant

25.

26.

27.

28.

29.

30. Transformation unconditional -> if

31.

32.

33.

34.

35. Transformation statement -> statements

36.

37.

38.

39.

40. Transformation unconditional -> if

41.

42.

43.

44.

45. Refactor time?

46.

47.

48.

49.

50.

51.

52.

53.

54.

55.

56.

57.

58.

59.

60. Transformation if -> while

61. Condition to loop transformation ! is a great indicator you are in the right track of solving the algorithm [Martin 13]

62.

63.

64.

65.

66.

67.

68.

69.

70.

71.

72.

73.

74.

75.

76.

77.

78.

79. Katas and Learning

80. Kata Deliberate Practice Koan Deliberate Learning • Optimising for performance • Optimising for discovery • Minimising variance • Maximising variance [North 12]

81. Learning TDD is learning all that TDD does for you

82. “The beauty of a move lies not in its' appearance but in the thought behind it.”

83. My System elements of chess positional play illustrative games

84. First learn the elements of design Then learn how to drive it with test

85. Marcello Duarte we are hiring try phpspec! follow @_md

86. inviqa.com/tdd-immersion-day/

87. Thank you !

88. Questions or Comments? joind.in/10711 @_md want to learn more? inviqa.com/tdd-immersion-day/

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