The document contains snippets of Ruby code and discussions around test-driven development (TDD) and behavior-driven development (BDD). It includes code examples using RSpec to test an AgeCalculator class, discussions of gems like rspec and test frameworks like Test::Unit. It also covers observer pattern and use of test doubles in RSpec tests. Live coding examples are presented on FizzBuzz implementation using TDD and RSpec best practices.

1. 2011.05.21
http://www.flickr.com/photos/bruce_mcadam/3214482163/
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2. 2011 5 22

3. mrkn
Ruby
Ruby
http://www.flickr.com/photos/koichiroo/5244581973/
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4. 2011
2010 5
3 22
1

5. http://www.flickr.com/photos/bruce_mcadam/3214482163/
2011 5 22

6. 2011.05.21
http://www.flickr.com/photos/bruce_mcadam/3214482163/
2011 5 22

7. 2011 5 22

8. http://www.flickr.com/photos/bruce_mcadam/3214482163/
2011 5 22

9. BDD
Behavior Driven Development
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10. TDD
Test Driven Development
2011 5 22

11. TDD
Test Driven Development
2011 5 22

12. TDD BDD
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13. 2011 5 22

14. 2011 5 22

15. 2011 5 22

16. 2011 5 22

17. test-unit
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18. module System
class AgeCalculatorTest < Test::Unit::TestCase
include RR::Adapters::TestUnit
def setup
@calc = AgeCalculator.with_birthday(1981, 7, 20)
end
def test_age_on
assert_equal(29, @calc.age_on(2011, 7, 19))
assert_equal(30, @calc.age_on(2011, 7, 20))
end
def test_age_today
d, m, y = [*Time.now][3..5]
stub(@calc).age_on
@calc.age_on_today
assert_received(@calc) {|c| c.age_on(y, m, d) }
end
end
end
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19. RSpec
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20. module System
describe AgeCalculator do
context ‘with birthday 1981-07-20’ do
subject { AgeCalculator.with_birthday(1981, 7, 20) }
describe ‘#age_on’ do
context ‘with 2011-07-19’ do
specify ‘the age is 29’ do
subject.age_on(2011, 7, 19).should be == 29
end
end
context ‘with 2011-07-20’ do
specify ‘the age is 30’ do
subject.age_on(2011, 7, 20).should be == 30
end
end
end
describe ‘#age_on_today’ do
it ‘calls age_on with year, month, and day on today’ do
d, m, y = [*Time.now][3..5]
subject.should_receive(:age_on).with(y, m, d)
subject.age_on_today
end
end
end
end
end
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21. 2011 5 22

22. 2011 5 22

23. 2011 5 22

24. TDD
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25. !Test"#$%
&'()$*
t-wada
http://d.hatena.ne.jp/t-wada/
2005+7,23-
@J2EE./012103
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22

26. !"#$%1
! TDD&'()*+,&-.
! "Test"/01213.45%&6784
" 9:;<=>?@A
" 2B%"Test"CDE&-.FGHIJKLF
" MNO5PQCRS
! '()TUVWXOYZ[4
" 9:#/ ]^#/ >?@A_`
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22

27. !"#$%1
! TDD&'()*+,&-.
! "Test"/01213.45%&6784
" 9:;<=>?@A
" 2B%"Test"CDE&-.FGHIJKLF
" MNO5PQCRS
! '()TUVWXOYZ[4
" 9:#/ ]^#/ >?@A_`
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22

28. !"#$%2
! TDD%"Test"&'(())%*+%,%
" -./0'(12%345
! TDD%67&89:;<=/>?@ABCD
:;EFG>/HIJKL
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22

29. !"#$%2
! TDD%"Test"&'(())%*+%,%
" -./0'(12%345
! TDD%67&89:;<=/>?@ABCD
:;EFG>/HIJKL
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22

30. http://blogs.itmedia.co.jp/hiranabe/2005/08/sd4__c05e.html
2011 5 22

31. http://blogs.itmedia.co.jp/hiranabe/2005/10/tdd__bdd__731d.html
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32. 2011 5 22

33. 2011 5 22

34. module System
describe AgeCalculator do
context ‘with birthday 1981-07-20’ do
subject { AgeCalculator.with_birthday(1981, 7, 20) }
describe ‘#age_on’ do
context ‘with 2011-07-19’ do
specify ‘the age is 29’ do
subject.age_on(2011, 7, 19).should be == 29
end
end
context ‘with 2011-07-20’ do
specify ‘the age is 30’ do
subject.age_on(2011, 7, 20).should be == 30
end
end
end
describe ‘#age_on_today’ do
it ‘calls age_on with year, month, and day on today’ do
d, m, y = [*Time.now][3..5]
subject.should_receive(:age_on).with(y, m, d)
subject.age_on_today
end
end
end
end
end
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35. 2011 5 22

36. http://www.flickr.com/photos/bruce_mcadam/3214482163/
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37. 2011 5 22

38. 2011 5 22

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40. 2011 5 22

41. http://gihyo.jp/dev/serial/01/ruby/0039
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42. http://www.nicovideo.jp/watch/sm12975849
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43. 2011 5 22

44. 2011 5 22

45. gem install rspec
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46. rspec
rspec-core
rspec-expectations
rspec-mocks
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47. 2011 5 22

48. gem install rspec
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49. http://www.flickr.com/photos/bruce_mcadam/3214482163/
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50. 2011 5 22

51. 2011 5 22

52. 2011 5 22

53. 2011 5 22

54. require ‘spec/test/unit’
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55. ‘spec/test/unit’
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56. http://www.slideshare.net/t_wada/sapporo-rubykaigi01-twada-lt-presentation
2011 5 22

57. (a.k.a id:t-wada)
Oct, 26, 2008 @SapporoRubyKaigi 01
http://www.slideshare.net/t_wada/sapporo-rubykaigi01-twada-lt-presentation
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58. 2011 5 22

59. 2011 5 22

60. 2011 5 22

61. 2011 5 22

62. Photo by rla579: http://flickr.com/photos/rla579/2482286520/
2011 5 22

63. Working Effectively with Legacy tDiary Code
using Cucumber and RSpec
KAKUTANI Shintaro; Eiwa System Management,Inc.; Nihon Ruby-no-kai
http://kakutani.com/articles/working_effectively_with_legacy_tdiary_code_using_cucumber_and_rspec.pdf
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64. 2011 5 22

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66. 2011 5 22

67. FizzBuzzCounter
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68. 2011 5 22

69. #
FizzBuzzCounter.new.each do |i|
p i
end
#=> 1
# 2
# “Fizz”
# 4
# “Buzz”
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70. #
fbc = FizzBuzzCounter.new
p fbc.next #=> 1
p fbc.next #=> 2
p fbc.next #=> “Fizz”
fbc.each {|i| break if i > 14 }
p fbc.next #=> “FizzBuzz”
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71. # Enumerable
fbc = FizzBuzzCounter.new
p fbc.take(3) #=> [1, 2, “Fizz”]
p fbc.take(3) #=> [4, “Buzz”, “Fizz”]
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72. 2011 5 22

73. spec/
spec_helper.rb
require ‘spec_helper’
2011 5 22

74. Live Coding
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75. RSpec Best Practice
http://jp.rubyist.net/magazine/?0032-TranslationArticle
2011 5 22

76. describe FizzBuzzCounter do
describe ‘.filter’ do
context ‘with 1’ do
it ‘returns 1’ do
FizzBuzzCounter.
filter(1).should be == 1
end
end
end
end
2011 5 22

77. describe FizzBuzzCounter do
describe ‘.filter’ do
context ‘with 1’ do
it ‘returns 1’ do
FizzBuzzCounter.
filter(1).should be == 1
end
end
end
end
2011 5 22

78. Observer Pattern
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79. observers
1 *
subject
+ change()
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80. 2011 5 22

81. 2011 5 22

82. 2011 5 22

83. 2011 5 22

84. Test Double
2011 5 22

85. describe ConcreteObservable do
describe ‘#change’ do
it ‘calls its notify()’ do
subject.should_receive(:notify)
subject.change
end
end
end
2011 5 22

86. describe ConcreteObservable do
describe ‘#change’ do
subject { ConcreteObservable.new }
it “calls observers’ update()” do
observer = double(‘an observer’)
observer.should_receive(:update)
subject.change
end
end
end
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87. http://ironruby.codeplex.com/
2011 5 22