Let's begin Behavior Driven Development using RSpec
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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.
![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
2011 5 22](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-18-320.jpg)
![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
2011 5 22](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-20-320.jpg)
![!"#$%1
! TDD&'()*+,&-.
! "Test"/01213.45%&6784
" 9:;<=>?@A
" 2B%"Test"CDE&-.FGHIJKLF
" MNO5PQCRS
! '()TUVWXOYZ[4
" 9:#/ ]^#/ >?@A_`
http://www.ne.jp/asahi/t/wada/articles/Test_in_TDD.pdf
2011 5 22](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-26-320.jpg)
![!"#$%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](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-27-320.jpg)
![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
2011 5 22](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-34-320.jpg)
![# Enumerable
fbc = FizzBuzzCounter.new
p fbc.take(3) #=> [1, 2, “Fizz”]
p fbc.take(3) #=> [4, “Buzz”, “Fizz”]
2011 5 22](https://image.slidesharecdn.com/clrh-20110521rspec-110521115040-phpapp01/85/Let-s-begin-Behavior-Driven-Development-using-RSpec-71-320.jpg)
Let's begin Behavior Driven Development using RSpec
- 2. 2011 5 22
- 3. mrkn Ruby Ruby http://www.flickr.com/photos/koichiroo/5244581973/ 2011 5 22
- 4. 2011 2010 5 3 22 1
- 7. 2011 5 22
- 9. BDD Behavior Driven Development 2011 5 22
- 10. TDD Test Driven Development 2011 5 22
- 11. TDD Test Driven Development 2011 5 22
- 12. TDD BDD 2011 5 22
- 13. 2011 5 22
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- 17. test-unit 2011 5 22
- 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 2011 5 22
- 19. RSpec 2011 5 22
- 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 2011 5 22
- 21. 2011 5 22
- 22. 2011 5 22
- 23. 2011 5 22
- 24. TDD 2011 5 22
- 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
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- 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 2011 5 22
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- 45. gem install rspec 2011 5 22
- 46. rspec rspec-core rspec-expectations rspec-mocks 2011 5 22
- 47. 2011 5 22
- 48. gem install rspec 2011 5 22
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- 51. 2011 5 22
- 52. 2011 5 22
- 53. 2011 5 22
- 54. require ‘spec/test/unit’ 2011 5 22
- 55. ‘spec/test/unit’ 2011 5 22
- 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 2011 5 22
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- 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 2011 5 22
- 64. 2011 5 22
- 65. 2011 5 22
- 66. 2011 5 22
- 67. FizzBuzzCounter 2011 5 22
- 68. 2011 5 22
- 69. # FizzBuzzCounter.new.each do |i| p i end #=> 1 # 2 # “Fizz” # 4 # “Buzz” 2011 5 22
- 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” 2011 5 22
- 71. # Enumerable fbc = FizzBuzzCounter.new p fbc.take(3) #=> [1, 2, “Fizz”] p fbc.take(3) #=> [4, “Buzz”, “Fizz”] 2011 5 22
- 72. 2011 5 22
- 73. spec/ spec_helper.rb require ‘spec_helper’ 2011 5 22
- 74. Live Coding 2011 5 22
- 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 2011 5 22
- 79. observers 1 * subject + change() 2011 5 22
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- 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 2011 5 22