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TDDの練習 Coding Kata の実践
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hakobe (Yohei Fushii)
April 19, 2014
Programming
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TDDの練習 Coding Kata の実践
hakobe (Yohei Fushii)
April 19, 2014
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Transcript
Coding Kata TDD practice with
hakobe hatena: id:hakobe932 twitter: @hakobe github: @hakobe
TDD Test Driven Developement
–Robert C. Martin “ཁ͢ΔʹTDDϓϩͷબͳͷͩɻ ࣮֬ੑɾܽؕࠞೖͷԼɾ༐ؾɾ υΩϡϝϯτɾઃܭΛଅਐ͢Δنͩɻ”
ϓϩͳΒTDDΛ͏
TDDͷࡾݪଇ 1. ࣦഊ͢ΔςετΛॻ͘·Ͱ ϓϩμΫγϣϯίʔυΛॻ͔ͳ͍ 2. ࣦഊͤ͞ΔతҎ֎ͰςετΛॻ͔ͳ͍ 3. ࣦഊ͢Δςετ͕ޭ͢Δ·Ͱ ଞͷϓϩμΫγϣϯίʔυΛॻ͔ͳ͍
Red Green Refactoring TDDͷ αΠΫϧ
࣮ફͰ͖ͯΔ? •͡ΊʹςετΛॻ͘บͰ͖ͯΔ? •͏·͘αΠΫϧΛ·ΘͤͯΔ? •ςετॻ͘ͷ͍͠෦ॻ͚Δ? •Fake It / Obvious Implementation /
Triangulation ͏·͘Ͱ͖ͯΔ?
࿅श
Coding Kata
Coding Kata ۭखͷܕʹͳͧΒ͑ͨɺϓϩάϥϛϯάͷ࿅शํ๏ɻ ! جຊతͳ՝Λ܁Γฦ͠࿅श͢Δ͜ͱͰɺ TDDͷΑ͏ͳنɺΤσΟλͷૢ࡞ํ๏ɺ Α͋͘ΔͷղܾखॱͳͲΛମʹછΈࠐ·ͤΔɻ
ϘϦϯάήʔϜ ‣10ϑϨʔϜ x ࠷େ 2 ͯ͠ 10 ݸͷϐϯΛ͢ ‣ετϥΠΫ Ϙʔφε:
࣍ͷ 2 ͷͨ͠ϐϯ ‣εϖΞ Ϙʔφε: ࣍ͷ 1 ͷͨ͠ϐϯ ‣10ϑϨʔϜ εϖΞ͔ετϥΠΫ͕ग़ͨΒ࠷େ3Ͱ͖Δ
ཁٻ༷ •roll(pins: Int) ϓϨΠϠʔ͕ϘʔϧΛ͛ͨ࣌ʹݺΕΔɻ Ҿͨ͠ϐϯɻ •score(): Int ͜ͷήʔϜͷείΞΛฦ͢ Game +
roll(pins: Int) + score(): Int
࣮ԋ Scala/spec2/IntelliJ/sbt
·ͱΊ • TDDϓϩͷश׳ • Coding KataͰ࿅शͯ͠ʹ͚ͭΑ͏ ࣮ࡍ͏·͍ͬͯ͘Δ? - TDDͷϦζϜ͕ʹͭ͘ -
։ൃڥྑ͘ͳΔ - ϓϩάϥϛϯάݴޠͷػೳΛֶΔ
ࢀߟจݙ • ΞδϟΠϧιϑτΣΞ։ൃͷԞٛ (ISBN: 978-4797347784) • εεϖοΫͷε ʲୈ 1 ճʳ
RSpec ͷ֓ཁ ͱɺRSpec on Rails (Ϟσϧฤ) ( http://magazine.rubyist.net/?0021-Rspec ) • ͜ͷൃදͷαϯϓϧίʔυ ( https:// github.com/hakobe/coding-kata-bowling )