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Summary of Diagnose unreliable code with test ...
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shunsuke sato
June 25, 2021
Programming
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Summary of Diagnose unreliable code with test repetitions
shunsuke sato
June 25, 2021
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Transcript
Summary of “Diagnose unreliable code with test repetitions” at WWDC
2021 !ू·Ε4XJGU͖ʂ4XJGUѪձεϐϯΦϑ88%$ηογϣϯཁձ
ࣗݾհ
໊લࠤ౻ढ़ี ৬ۀϞόΠϧΞϓϦΤϯδχΞʢJ04ΛϝΠϯʹ"OESPJEͪΐͬͱʣ ॴଐגࣜձࣾΞϯυύου ʮݐங%9ʯΛ͍ͬͯΔձࣾ ࠓͷJ04%$ͷϓϥνφεϙϯαʔ
5XJUUFS!VTIJTBOUPBTPCV झຯίʔώʔɺαοΧʔɾϑοταϧ
Diagnose unreliable code with test repetitions
ҰݴͰ·ͱΊΔͱ ʮෆ҆ఆͳςετʢ࣌ʑίέΔςετʣʯΛͨ͢Ίʹ ʮςετͷ܁Γฦ࣮͠ߦʯػೳ͕Ճ͞Εͨ
ηογϣϯͷߏ ʮςετͷ܁Γฦ࣮͠ߦʯػೳͷ֓ཁ ʮςετͷ܁Γฦ࣮͠ߦʯػೳΛ༻͍ͨσϞ 5JQTʢYDPEFCVJMEίϚϯυ·ΘΓʣ
ηογϣϯͷߏ ʮςετͷ܁Γฦ࣮͠ߦʯػೳͷ֓ཁ ʮςετͷ܁Γฦ࣮͠ߦʯػೳΛ༻͍ͨσϞ 5JQTʢYDPEFCVJMEίϚϯυ·ΘΓʣ
ʮςετͷ܁Γฦ࣮͠ߦʯػೳͷ֓ཁ
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ ෆ҆ఆͳςετΛ͢ͷ͕͍͠ཧ༝
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ ෆ҆ఆͳςετΛ͢ͷ͕͍͠ཧ༝ ࠶ݱ͢ΔʢίέΔʣͷ͕͍͠
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ ෆ҆ఆͳςετΛ͢ͷ͕͍͠ཧ༝ ࠶ݱ͢ΔʢίέΔʣͷ͕͍͠ ͦͷղܾํ๏ͷखஈͷ͕̍ͭʮςετΛ܁Γฦ͢ʯ͜ͱ
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ ෆ҆ఆͳςετΛ͢ͷ͕͍͠ཧ༝ ࠶ݱ͢ΔʢίέΔʣͷ͕͍͠ ͦͷղܾํ๏ͷखஈͷ͕̍ͭʮςετΛ܁Γฦ͢ʯ͜ͱ
৽͘͠Ճ͞ΕΔʮςετͷ܁Γฦ࣮͠ߦʯػೳʹ̏ͭͷϞʔυ͕͋Δ
ෆ҆ఆͳςετ͕ੜ·ΕΔݪҼ ڝ߹ঢ়ଶڥґଘάϩʔόϧεςʔτ֎෦αʔϏεͱͷ࿈ܞ ෆ҆ఆͳςετΛ͢ͷ͕͍͠ཧ༝ ࠶ݱ͢ΔʢίέΔʣͷ͕͍͠ ͦͷղܾํ๏ͷखஈͷ͕̍ͭʮςετΛ܁Γฦ͢ʯ͜ͱ
৽͘͠Ճ͞ΕΔʮςετͷ܁Γฦ࣮͠ߦʯػೳʹ̏ͭͷϞʔυ͕͋Δ ͦΕͧΕͲ͏͍ͬͨಈ͖Λ͢Δͷ͔ɾ༻్Կ͔ɺ͕͜ͷηογϣϯͷ Ұ൪େࣄͳͱ͜Ζ
'JYFEJUFSBUJPOT
ޭࣦഊΘͣɺࢦఆͨ͠ճςετΛ࣮ߦ͢Δ ༻్ʮςετʹෆ҆ఆ͕͞ͳ͍͔ʯΛ֬ೝ͢ΔͨΊ 'JYFEJUFSBUJPOT
6OUJMGBJMVSF
ࢦఆͨ͠ճςετΛ࣮ߦ͢Δ͕ɺࣦഊ࣌Ͱऴྃ͢Δ ༻్ʮෆ҆ఆͳςετΛ͢ʢσόοά͢Δʣʯͱ͖ʹར༻͢Δ 6OUJMGBJMVSF
3FUSZPOGBJMVSF
ࢦఆͨ͠ճςετΛ࣮ߦ͢Δ͕ɺޭͨ࣌͠Ͱऴྃ͢Δ ༻్ʮ͡Ίࣦഊ͢Δ͕͍ͣΕޭ͢ΔΑ͏ͳςετʯΛಛఆ͢ΔͨΊ 3FUSZPOGBJMVSF
ʮςετͷ܁Γฦ࣮͠ߦʯػೳΛ༻͍ͨσϞ
࠷ۙ$*Ͱςετ͕࣌ʑίέΔ͜ͱʹؾͮ͘
ʮςετͷ܁Γฦ࣮͠ߦʯػೳΛҰ࣌తʹΦϯʹͯ͠࠶$*ͰςετΛ࣮ߦͯ͠ΈΔ
ͬͺΓϥϯμϜͰίέΔΑ͏ͩ
ϩʔΧϧͰ࠶ݱ͢Δ͔ࢼͯ͠ΈΑ͏ʢz3VOUFTU4PNF 3FQFBUFEMZzΛબʣ
l'JYFEJUFSBUJPOTzϞʔυʢճʹࢦఆʣͰ࣮ߦ
ϩʔΧϧͰϥϯμϜͰίέΔ͜ͱ͕࠶ݱͰ͖ͨʂʢճίέͨʣ
ϥϯμϜͰίέΔݪҼΛಛఆ͠Α͏ʢl6OUJMGBJMVSFzϞʔυͰ࣮ߦʣ
ςετ͕ίέͨͱ͖ʹσόοΨ͕ىಈ͞ΕΔʂ
मਖ਼Ͱ͖ͨΒ࠶z'JYFEJUFSBUJPOTzϞʔυͰ࣮ߦͯ͠ΈΔ
ճςετ͕ޭͨ͠🎉ʢ͜ͷςετ͔Βෆ҆ఆ͕͓ͦ͞Β͘ফ͑ͨʣ
·ͱΊ
ෆ҆ఆͳςετʢ࣌ʑίέΔʣͱ͍͏ͷ͕͋Δ ͦͷಛఆͷͨΊͷखஈͷ͕̍ͭʮςετͷ܁Γฦ࣮͠ߦʯ ৽͘͠ʮςετͷ܁Γฦ࣮͠ߦʯͷػೳ͕Ճ͞ΕͨͷͰɺෆ҆ఆͳςετ ͕ݟ͔ͭͬͨΒɺ͜ͷػೳͰಛఆɾमਖ਼Ͱ͖ͳ͍͔ࢼͯ͠ΈΑ͏
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠😊