JaSST Tohoku 2014 Keynote

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ςετɺઃܭɺ ࣗಈԽͱɻ seki@ruby-lang.org ! author of dRuby, Rinda, ERB and Drip !

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ͳͥࢲͷ࿩Λௌ͘ͱ͓ಘ͔ XP௕͍Α JaSST’04 ೜ऀࣜςετ ૊ΈࠐΈ/C/C++ ΋͏͙͢550ΠςϨʔγϣϯ ઙ͍୳ڀ৺ ఻આ্ͷଘࡏ

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఻આ্ͷଘࡏ Learn from legendary Japanese Ruby hacker Masatoshi Seki in this ﬁrst English-language book on his own Distributed Ruby library. You'll ﬁnd out about distributed computing, advanced Ruby concepts and techniques, and the philosophy of the Ruby way---straight from the source.

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The dRuby Book PragProgͰbuy now!

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ͱͪ͗ςετͷձٞ3 ͍͔͢ςετఱࠃʢԾʣ 2014-10-04 ʢԾʣ ಢ໦ͷͲ͔͜ ΘΓͱ͍͔͢༧ఆ

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ࠓ೔ͷ࿩ ઃܭͱςετ TDDͷ͓͞Β͍ ςετͷࣗಈԽɾܭࢉػࢧԉ TDDͷมܗͱ։ൃϥΠϒ

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ઃܭͱςετ͸ผͳͷʁ چੈل͔Βͷڧ͍ٙ໰ Ͳ͔͜ΒͲ͜·Ͱ͕ઃܭͳͷ͔ ઃܭͱ͸اΈશͯ͡Όͳ͍ͷ͔ ࢒͢Ձ஋ͷ͋Δઃܭ৘ใ͸ͳʹ͔ ςετ͙Β͍͡Όͳ͍͔

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ઃܭͱςετ ࠷ۙങ͍·ͨ͠!!! Զͷઃܭͱςετ ؾ͕߹͍ͦ͏

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ιϑτ΢ΣΞͷ։ൃ ιϑτ΢ΣΞͷ։ൃ͸ɼ̎छྨͷ࡞ۀΛؚΜͰ͍Δɽ! ઃܭͱςετͰ͋Δɽ! ! (ιϑτ΢ΣΞͷ৴པੑ p.33)

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ઃܭͱ͸ͳʹ͔ ʮܭըʹैͬͯܗΛ੔͑Δ͜ͱɽʯ! ͜ͷҙຯΛͱΕ͹ɼཁٻ΍໨తΛఆΊΔ͜ͱʹ࢝·Γɼ! ϓϩάϥϜΛॻ͘͜ͱʹࢸΔιϑτ΢ΣΞͷ࢓ࣄશମʹ! ΘͨΓɼͦΕͧΕͷ৔໘ʹԠͯ͡ɼઃܭ͕͋Δͱߟ͑Δ! ͜ͱ͕Ͱ͖Δɽ! ! (ιϑτ΢ΣΞͷ৴པੑ p.33)

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ઃܭͱ͸ͳʹ͔ ͋ΒΏΔߦҝ͸ઃܭͰ͋Δ ཁٻɺ࢓༷ɺίʔσΟϯά…

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ςετͱ͸ͳʹ͔ ΤϥʔΛൃݟ͢Δ໨తͰϓϩάϥϜΛ࣮ߦ͢Δաఔ͕! ςετͰ͋Δɽ! ! (ιϑτ΢ΣΞͷ৴པੑ p.194)

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Α͍ςετ ΤϥʔΛൃݟͰ͖ͨΒ੒ޭ ΤϥʔΛൃݟ͢Δ֬཰ͷߴ͍΋ͷ͕ྑ͍

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ςετͷ৺ཧֶ Τϥʔ͕͋Δ͜ͱΛࣔͦ͏ͱ͢Ε͹ɺΤϥʔ ͸ͨ͘͞ΜΈ͚ͭΒΕΔ Τϥʔ͕ͳ͍͜ͱΛࣔͦ͏ͱ͢Ε͹ɺΤϥʔ ͸͋·ΓΈ͔ͭΒͳ͍

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ιϑτ΢ΣΞͷ։ൃ͸ ೋͭͷଶ౓ͰͰ͖͍ͯΔ ੔ཧ͠ੈքΛߏங͍ͯ͘͠ઃܭ ͦΕΛ͍ٙഁյ͢Δςετ

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͓·͚ ͋ΔνʔϜͷ৺ཧ ✴ ཧ૝ͱݱঢ়ͱͷࠩΛຒΊΑ͏ ✴ όάͱ͔࢓༷ͱ͔͋Μ·Γؾʹ͠ͳ͍ ✴ (૝૾্ͷ) ΑΓΑ͍੡඼ͱͷࠩ ✴ ࢖͍΍͢͞ɺݟͨ໨ɺੑೳɺख৮Γ…શͯ ✴ ࠩΛ୳͢ߦҝ - ςετ͔ͳ͊ ✴ ࠩΛຒΊΔߦҝ - ͨͿΜઃܭ

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Τϥʔͱ͸Կ͔ Τϥʔͱ͸Կ͔ ! Α͋͘ΔఆٛͷҰͭ͸ɼ࢓༷ͷ௨Γʹιϑτ΢ΣΞ͕ ࣮ߦ͞Εͳ͍࣌…! ! (ιϑτ΢ΣΞͷ৴པੑ p.5)

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ࠜຊతͳ͕ܽؕ͋Δ Τϥʔͱ͸Կ͔ ! Α͋͘ΔఆٛͷҰͭ͸ɼ࢓༷ͷ௨Γʹιϑτ΢ΣΞ͕ ࣮ߦ͞Εͳ͍࣌ʹιϑτ΢ΣΞͷΤϥʔ͕ੜͨ͡ͱ͢ Δ΋ͷͰ͋Δɽ͜ͷఆٛʹ͸ࠜຊతͳ͕ܽؕ͋Δɽ! ! (ιϑτ΢ΣΞͷ৴པੑ p.5)

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஌ͬͯͨ ࢓༷͕ৗʹਖ਼֬Ͱ͋Δ͜ͱΛલఏʹ͍ͯ͠Δɽ͜ͷલ ఏ͕ਖ਼͍͜͠ͱͷ΄͏͕ɼΉ͠ΖكͰ͋Δɻ! ! (ιϑτ΢ΣΞͷ৴པੑ p.5)

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͜Μͳ࿩ҙຯ͋Μͷʁ ࣗ෼ͨͪͷߦಈ͕ͳΜͳͷ͔ཧղͯ͠ΈΔ ཧղͷ࿮૊Έ ΍ΓํΛม͑Δࢦ਑ʹ

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͠͹Β͓͘଴͍ͪͩ͘͞ ✓ +10:00͗͢ ✓ ϚΠϠʔζͷઃܭͱςετΛࣗຫ ✓ ͭ͗͸ʮTDD͓͞Β͍ʯ

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ςετͷࣗಈԽ ΩʔϊʔτͰ༩͑ΒΕͨςʔϚ ςετͷࣗಈԽΛ૝૾Ͱ͖·͔͢ʁ ઃܭͷࣗಈԽ͸Ͳ͏Ͱ͔͢ʁ ͦ΋ͦ΋ࣗಈͬͯͳʹʁ ࣗಈ࣮ߦ ܭࢉػʹΑΔࢧԉ

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ςετͷࣗಈԽ ͯΏ͔ςετͷࣗಈԽ͕ΰʔϧͳͷʁ

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TDDͷ͓͞Β͍ ςετͷࣗಈԽͷྫͱ͓ͯ͠͞Β͍͍ͨ͠ ςετۦಈ։ൃ ςετʹಋ͔Εͨϓϩάϥϛϯάͷٕ๏ ઃܭͷςΫχοΫ

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TDDͷαΠΫϧ ࣍ͷ໨ඪΛߟ͑Δ ͦͷ໨ඪΛࣔ͢ςετέʔεΛॻ͘ ίʔυΛॻ͖ɺςετΛύεͤ͞Δ ςετ͕௨Δ··ͰɺϦϑΝΫλϦϯά ܁Γฦ͠

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໨ඪΛߟ͑Δ ໨ඪ͜͜ʹ͢Δˠ ←͍·͜͜

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Red ໨ඪΛςετͰදݱ͢Δˠ

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Green ςετʹԊ࣮ͬͯ૷ˠ ←͜͜·ͰͷಓͷΓ͔Β΋֎Εͳ͍

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Refactor ࣮૷Λચ࿅ͤ͞Δˠ ←͜͜·ͰͷಓͷΓ͔Β΋֎Εͳ͍

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·ͨ͘Γ͔͑͢ ࣍ͷ໨ඪ͸͜͜ˠ

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ঢ়ଶͷαΠΫϧ ໨ඪઃఆ ࣮૷ ચ࿅

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ঢ়ଶͷαΠΫϧ Red Green Refactor

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ؾ෼ ಈ͘ ͖Ε͍

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TDDͷςετέʔε TDD͸ઃܭٕ๏ ΰʔϧΛςετέʔεͰදݱ ςετέʔεΛߟ͑Δ͜ͱࣗମ͕ઃܭ ઃܭͱςετͳΒઃܭʹ͍ۙ

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TDDͷςετέʔε Α͍ςετ͔ʁʢΤϥʔΛൃੜ͢Δ֬཰ʣ Ұ౓໨͸Red 㱺 ͜Εͬͯ੒ޭͳͷʁ ೋ౓໨Ҏ߱͸௿֬཰ έΞϨεϛεΛ଴ͪ෬ͤ

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ࣗಈςετͬΆ͍ʁ ܭࢉػ͕ςετΛ࣮ߦͯ͘͠ΕΔ ͜͜·Ͱḷ͖֤ͬͯͨεςοϓͷΰʔϧ ΛԿ౓Ͱ΋࣮ߦͰ͖Δ ࣗಈςετͬΆ͍

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ίετͱ֬཰ ࡞੒ίετ͸ΘΓͱ͍҆ গͣͭ͠ॻ͘ͷͰ໘౗͡Όͳ͍ ࣮ߦίετ͸ͱͯ΋͍҆ ໰୊Λൃݟ͢Δ֬཰͸௿͍

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Checking vs. Testing Checking ط஌ͷ৘ใͷ֬ೝ Testing ৽͍͠৘ใΛ୳͢ɻະ஌ͷ෺ɻ JaSST'11 TokyoɺLee Copeland͕ݴͬͯͨ୭͔ͷblog

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Checking JaSST’11 Keynote ations 7 Checking vs. Testing • Checking is something that we do with the motivation of confirming existing beliefs • Checking is a process of confirmation, verification, and validation. When we already believe something to be true, we verify our belief by checking • Checking is a highly automatable process 8 Michael Bolton http://www.developsense.com/blog/2009/08/testing-vs-checking/ sting Trends and Innovations

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Testing JaSST’11 Keynote Checking vs. Testing • Testing is something that we do with the motivation of finding new information • Testing is a process of exploration, discovery, investigation, and learning. When we configure, operate, and observe a product with the intention of evaluating it, or with the intention of recognizing a problem that we hadn’t anticipated, we’re testing • Testing is not automatable. It’s using our brain in real time, and it’s really fun 9 Trend • Process − Conte − Check − Crowd − The W − Explo Crowdsourced Testing Crow

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ط஌ͱະ஌ ✴ ͦ͏͍͑͹

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http://web.sfc.keio.ac.jp/~iba/sb/log/eid75.html IBALOG - Concept Walk ೔ຊޠ൛ | ʮݚڀʯͱʮษڧʯͷҧ͍

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ςετέʔεͷࣗಈ࣮ߦ Checking ࣗಈԽ͠΍͍͢ ط஌ͷ৘ใͷ֬ೝ ଴ͪ෬ͤ

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TDDҎ֎ͷࣗಈ࣮ߦ ࡞੒ίετߴͦ͏ʢTDDൺʣ Θ͟Θ͟࡞ΔͷΊΜͲ͍͘͞ؾ෼ WinRunnerͱ͔ ࣮ߦίετ͸͍͚҆Ͳ

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Checkingͷࣗಈ࣮ߦ ςετέʔεͷࣗಈ࣮ߦ ૝૾͠΍͍͢ ͍͔ʹ΋Ͱ͖ͦ͏ͳؾ͕͢Δ ͡Ό͋ଞͷ΋ͷ͸Ͳ͏ͳͷʁ

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͠͹Β͓͘଴͍ͪͩ͘͞ ✓ +20:00͗͢ ✓ TDD͓͞Β͍ ✓ ࣍͸Testing΍ͦͷଞͷܭࢉػࢧԉ

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ͦΕҎ֎ͷྖҬ ະ஌ͷ໰୊ͷൃݟΛख఻ͬͯ΋Β͏ʹ͸.. ςετέʔεࣗಈ࣮ߦҎ֎ʹԿ͔ͳ͍ͷʁ

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ωλ ෆ۩߹͔Βͷෆ۩߹ࣗಈੜ੒ ςετεΠʔτͷϦίϝϯυ ͖ͭͮ͸ΈΜͳ͕ߟ͑ͯ!

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ෆ۩߹͔Βͷෆ۩߹ࣗಈੜ੒ ܭࢉػʹΑΔTestingͷࢧԉ Սۭͷෆ۩߹Λੜ੒͢Δπʔϧ ૝૾Ͱ͖ͳ͍໰୊Λ૝૾͢ΔͨΊʹ࢖͏ ෆ۩߹σʔλϕʔεͱϚϧίϑ࿈࠯

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ෆ۩߹σʔλϕʔε ;ͭ͏ຖ೔ಡΈ߹ΘͤΛ͢Δ΋ͷ ෆ۩߹͔ΒةݥΛײ͡Δ೴಺഑ઢΛҭͯΔ ൓ࣹਆܦ ੸਷൓ࣹ

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ෆ۩߹Λ૝૾ͯ͠ςετ͢Δ ͍ͭ΋ͷTestingΛࢥ͍ग़ͯ͠Έͯ! ແ͔Βੜ·ΕΔΘ͚Ͱ͸ͳ͍ ͜Ε·ͰͷֶशͰಘΒΕͨύλʔϯ ͔ͦ͜Β͋Γͦ͏ͳΠϠͳ͜ͱΛબ୒

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೴಺Ͱ͸ ݱࡏͷঢ়گ͔Βແ਺ͷύλʔϯΛੜ੒͠ݟࠐ Έͷ͋Γͦ͏ͳ਺ݸΛબͿɺͱ͍͏܁Γฦ͠ ΛҰॠͰܭࢉ͍ͯ͠Δ ͪΐͬͱӕ͔΋

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೴಺Ͱ͸ ঢ়گ

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͍Ζ͍Ζࢥ͍ͭ͘ ঢ়گ ωλ ωλ ωλ ωλ ωλ ωλ ωλ ωλ

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ݟࠐΈͷ͋Δͷ͸ͲΕ͔ͳ ঢ়گ ΞΠσΞ ΞΠσΞ ΞΠσΞ ΞΠσΞ ΞΠσΞ ΞΠσΞ ΞΠσΞ ΞΠσΞ

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όάʹग़ձ͑ͦ͏ͳͷΛ࠾༻ ঢ়گ ωλ ωλ ωλ ωλ ποίϛ ωλ ωλ ποίϛ

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࡞੒ͨ͠γεςϜ աڈෆ۩߹Λֶश͠ɺ͋Γͦ͏ͳෆ۩߹Λ ࣗಈੜ੒͢ΔϓϩάϥϜ ποίϛͷωλΛੜ੒͢Δ

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࣮૷͸؆୯ ܗଶૉ෼ੳͱϚϧίϑ࿈࠯Λ༻͍Δ จষΛͨ͘͞Μֶशͤ͞ΔͱͦΕΒ͍͠จ ষΛੜ੒Ͱ͖Δ ཁ໿γεςϜ ِ࿦จੜ੒ͳͲ

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ωλͷੜ੒Λػցʹ΍ΒͤΔ ঢ়گ ωλ ωλ ωλ ωλ ωλ ωλ ωλ ωλ

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ςΩετ 実⾏行中にcloseͨ͠ΒϩοΫͨ͠ࡍͷڍಈ͕ม

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ςΩετ で再⽣生表⽰示を⾏行うと変な残像が⾒見える

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ςΩετ શ෦ফͨ͠ΒInsert΋Reset΋ग़དྷͳ͍

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ςΩετ されず、ページ変更も⾏行なえなかった。

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ςΩετ 3Dの1ຕ͚ͩҾ͖ܧ͙ͱμϝͳ৔߹͕͋Δ

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! の設定が反映されない ! ☕ ️☕ ️☕ ️のボタンの下に表⽰示されていないときがある ! ͋Δ 名にマイナスが⼊入⼒力できない ! Save΅ͨΜ͕ͳΜ͔มɻ ! ฏۉΛٻΊΔ࣌ʹ の視点位置が変更すると原画の断⾯面線が出ない。 ! ಡΈࠐΈΛabort͢Δͱ͖Ε͍ʹฒ͹ͳ͍ ! のオブジェクト１だけを選んでもプリセット3͕ద༻͞ΕΔ৔߹͕͋Δɻ ! ページで読み込むと、が閉じる。 ! ΦϒδΣΫτొ࿥/࡟আΛ࣮ߦͨ͠Βɺ が死んだ ! ෳ਺ બ୒ͯ͠΋ ϑΥʔϚοτΛมߋͨ͠Βɺ ウィンドーが消えた。 ! が最⼩小値と値を加えるとエラーにならないときにマウスカーソル⭐ ️⭐ ️⭐ ️⭐ ️⭐ ️補し ͷʹ֯౓͕෇͘

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ӕͰ΋ใࠂ͞ΕͨΒ ϓϩάϥϚ͸͙͢ʹ࠶ݱࢼݧ͠Α͏ͱͨ͠ Γൃੜ͢ΔՄೳੑΛߟ͑ͨΓ͢Δ... ӡ͕ྑ͚Ε͹͔ͦ͜Β৽͍͠ෆ۩߹Λൃ ݟ͢Δ͔΋!!!

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ςετεΠʔτͷϦίϝϯυ खಈͰ΍Δςετͷ࿩ ݱࡏͷ։ൃঢ়گͰɺόάͷൃݟͰ͖Δ֬ ཰ɺൃੜͨ࣌͠ʹଛ֐ͷେ͖ͳ΋ͷΛਪન ͋ͱ1िؒͳΒͳʹΛ͢Δ΂͖͔ ϥΠτφʔγεςϜͷԠ༻

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ϥΠτφʔγεςϜ ෮शִ͕ؒ࣍ୈʹԆͼΔִؒ൓෮ֶश ΦʔϓϯΫϥε޲͖

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ͦͷଞͷܭࢉػࢧԉ ੩తղੳ ಈతղੳ ίϯίϦοΫςετ σόοάͱҧΘͳ͍ؾ΋͢Δ͚Ͳࡉ͔͍ ෼ྨ͸ؾʹ͠ͳ͍ ΋ͬͱ͍͍ͷ͕͋Δͱ͓΋͏ΑɺΈΜͳ!

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தకΊ ϚΠϠʔζͷઃܭͱςετ TDDͷ͓͞Β͍ͱChecking TestingͷࣗಈԽ͸Έͳ͞ΜͰ ! ࣍͸։ൃϥΠϒͷલʹ…

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͠͹Β͓͘଴͍ͪͩ͘͞ ✓ +30:00͗͢ ✓ தకΊ ✓ ͭ͗͸։ൃϥΠϒͷલ;Γɻ͕࣌ؒͳ͚Ε͹ඈ͹͢

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TDDBCେࡕͰ΍ͬͨ͝ఏҊ Red Green Refactor ͪΐͬͱͣͭԾઆͷ্ʹԾઆΛॏͶͯੵ Έ͋͛Δؾ෼ + Destroy ͦ͏ݴ͏͚ͲͲ͔ͬؒҧͬͯΔΜ͡Όʁ ͜ͷ࣮૷ͳΒ͜͜Ͱcore dumpͩΖ

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Destroy Red Green RefactorͷαΠΫϧʹͨ·ʹࠞͥ Δ ͜ͷ࣮૷ͳΒ͜ΕͰόά͕ग़ΔͩΖ!Έ͍ͨ ͳͷΛೋਓͰߟ͑ͯςετέʔεΛॻ͖࣮ߦ ͢Δ ౰ͨΕ͹Redɺ֎ΕΕ͹Green

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Destroyͱ͸ ࣗ෼ͨͪͷίʔυΛഁյ͢Δ TDDͷαΠΫϧʹ࣋ͪࠐΉ όάΛݟ͚ͭΔ๧ࢠ

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ٙͬͯյͯ͠ΈΔ ৽͍͠໰୊ͷൃݟ

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ΑΓྑ͘ɺΑΓڧ͘ ڧ͘͢Δ

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৽͍͠ࢦ਑ ಈ͘ ͖Ε͍ ڧ͍

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Destroy Red Refactor Destroy Green Green

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͜Ε͸TDD͔ ͍ͭ΋͸ݐઃతͳଶ౓ͰྟΉ ͨ·ʹഁյతͳࢥߟΛ࣋ͪࠐΉ CheckingͷதʹTestingΛ

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ݟ͔ͭͬͨ໰୊͸ط஌͡ΌΜ ✴ Testingً͕͘ͷ͸Ұॠ ✴ Ұ౓ղ͍ͨ໰୊͸໌೔ͷChecking

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࣍͸։ൃϥΠϒ +Destroy͢Δ͚ͲTDDͷTest First͠·ͤΜ ࢲ͕ίʔυΛॻ͖·͢ ΈΜͳͰόά͕ग़ͦ͏ͳςετέʔεΛఏ Ҋͯ͠Ͷ!