Breaking the Flaky Test Cycle

by Shinichi Maeshima

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!XJMMOFU #SFBLJOHUIF'MBLZ 5FTU$ZDMF

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Shinichi Maeshima    @netwillnet @willnet https://blog.willnet.in Willnet Inc.

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ٕज़ސ໰ۀΛ͍ͯ͠·͢

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͓࢓ࣄ4/4తͳ΋ͷΛ։ൃ ͍ͯ͠·͢

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!XJMMOFU #SFBLJOHUIF'MBLZ 5FTU$ZDMF ࠓ೔͸'MBLZͳςετͷ ࿩Ͱ͢

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'MBLZͳςετͱ͸ʁ w ࣮ߦ݁Ռ͕ෆ҆ఆͳςετ w ݪҼ͸༷ʑ w &&ςετͰΫϦοΫ࠲ඪΛؒҧ͑ͨ w ςετ࣌ͷมߋΛ໭͢ͷΛ๨Ε͍ͯͨ w ࣮ߦ͢Δ࣌ؒ΍೔ʹΑࣦͬͯഊ͢Δ w PSEFSCZ͕͍͍ͭͯͳ͍ΫΤϦൃߦ

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'MBLZͳςετ͕͋ ͬͨΒͲ͏͢Δʁ

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௨Δ·Ͱ࠶࣮ߦ

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🙅

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ؾ࣋ͪ͸Θ͔Δ͚Ͳʜ w $*͕௨Δ·Ͱ଴͍ͬͯΔؒͷ࡞ۀ͕଺Δ😩 w $*࣮ߦ࣌ؒɺΤϯδχΞͷ਺ɺςετͷࣦഊ཰ͦΕͧΕʹ ൺྫͯ͠଺Δ w ผͷ͜ͱΛ͍ͯͯ͠΋εΠονϯάίετ͕͔͔Δͧ w $*αʔϏε΁ͷ՝ֹۚ΋૿͑Δ💰 w ςετ͕ΦΦΧϛগ೥Խ͢Δ🐺 w ຊ౰͸࣮૷͕ѱͯ͘΋࠶࣮ߦͰ௨ͬͯ͠·ͬͨΒεϧʔ͞ Εͯ͠·͏

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؇࿨ࡦ

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IUUQTIBOBDIJOIBUFCMPKQFOUSZ

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ࣦഊͨ͠ςετͷ࠶࣮ߦΛ ϫʔΫϑϩʔʹ૊ΈࠐΉ

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͋͘·Ͱ؇࿨ࡦ

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ࠜຊղܾ͍ͨ͠ʂ

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IUUQTCMPHXJMMOFUJOFOUSZ

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ཁ໿͢Δͱ w ςετࣦഊ࣌ͷৼΔ෣͍Λௐ΂Δ ϩάɺεΫγϣɺσό οΨʹΑΔϒϨʔΫϙΠϯτͳͲ w ςετ͕Ͳ͏ಈ͍͍ͯΔͷ͔஌͓ͬͯ͘ඞཁ͕͋Δͧ w 3BJMTΛ஌Ζ͏ w ςετͷઃఆΛ஌Ζ͏ w DBQZCBSB TFMFOJVN ͕Ͳ͏ಈ͍͍ͯΔͷ͔஌Ζ͏

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ݱঢ়ɺGMBLZ ςετͷݪҼΛ ௐࠪ͢Δʹ͸෯ ޿͍஌͕ࣝඞཁ

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݁Ռͱͯ͠ γχΞΤϯδχΞ ʹ࢓ࣄ͕ूத͢Δ

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γχΞΤϯδχΞ͸ଞͷ ࢓ࣄ΋͋ΔͷͰͳ͔ͳ͔ GMBLZςετ͸ݮΒͳ͍

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ͭΒ͍

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࢓૊ΈͰঢ়گΛม͑ ͍ͨ

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ࣗ෼ͷ࡞ͬͨ࢓૊Έɺଞ ͷਓ͕࡞ͬͨ࢓૊ΈͰศ རͳ΋ͷΛ঺հ͠·͢

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࢓૊Έ

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GMBLZςετ Λ๷͙࢓૊Έ

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GMBLZͷݪҼͷ Ұͭ ΫϦοΫϛε

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$BQZCBSB͕ཁૉΛΫϦοΫ͢Δ·Ͱ w ΫϦοΫ͍ͨ͠ཁૉͷ࠲ඪΛௐ΂Δ w ͜͜ʹগ͠λΠϜϥά͕͋Δ w ௐ΂ͨ࠲ඪΛΫϦοΫ͢Δ

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%0.ཁૉ͕ಈ͘ͱ ΫϦοΫʹࣦഊ͢ Δ͜ͱ͕͋Δ

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$BQZCBSBEJTBCMF@BOJNBUJPOUSVF

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IUUQTHJUIVCDPNUFBNDBQZCBSBDBQZCBSBCMPCBCGFBCCCFGDDDDGDMJCDBQZCBSBTFSWFSBOJNBUJPO@EJTBCMFSSC--

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DTTͱK2VFSZ ىҼͷΞχϝʔ γϣϯΛΦϑʹ ͢Δ

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K2VFSZҎ֎ͷ KTʹΑΔΞχϝʔ γϣϯ͸ະରԠ😇

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5*14։ൃ؀ڥͰDBQZCBSBͷΞχ ϝʔγϣϯΦϑ͕ޮ͍͍ͯΔ͔ࢼ͢ w (FN fi MFͷDBQZCBSBͷHSPVQΛมߋͯ͠EFWFMPQNFOUͰ ΋༗ޮʹ͢Δ w DPO fi HBQQMJDBUJPOSCʹҎԼΛ௥ه

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ଞʹ΋%0.ཁ ૉΛಈ͔͢෺͕ ͋Δ

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🏞

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ը૾ͷ ஗Ԇ ಡΈࠐΈλ ΠϛϯάͱΫϦοΫͷλ Πϛϯά͕Ұக͢Δͱ☠

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XJMMOFUDBQZCBSBXBJU@JNBHF

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No content

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HFNΛಋೖ͢Δͩ ͚Ͱɺը૾ͷಡΈࠐ ΈىҼͷΫϦοΫϛ ε͕ແ͘ͳΔ

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࢓૊Έ

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ָʹௐࠪͰ͖Δ࢓૊Έ

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$*ͷΈ͔ͭكʹ͔͠ ى͖ͳ͍GMBLZςε τௐࠪͰେࣄͳ΋ͷ

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ϩά

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Ͱ΋֘౰ͷςε τͷϩά͕ຒ΋ Εͯ͠·͏

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XPSLBSPVOE

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.#௒͑ΔΑ͏ͳϩά ͔ΒHSFQ͢Δͷ͸͍ͨ΁Μ

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XJMMOFUDJ@MPHHFS

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ࣦഊͨ͠ςε τͷϩά͚ͩ ग़ྗͰ͖Δ

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࣍

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&&ςετࣦഊ࣌ͷε ΫϦʔϯγϣοτ΋ ௐࠪ࣌ʹ༗ޮ

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$ZQSFTT΍ 1MBZXSJHIUΛ࢖͏ͱಈ ըͰϒϥ΢βͷಈ࡞Λ ݟΔ͜ͱ͕Ͱ͖ͯศར

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๻ͨͪ΋࢖͍͍ͨ

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:VTVLF*XBLJ DBQZCBSBQMBZXSJHIU ESJWFS

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υϥΠόΛม͑ͣ ʹಈըΛࡱΓ͍ͨ

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ZZBHJUFTUSFDPSEFS

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TFMFOJVNͰಈը͕ࡱΕ Δ DVQSJUF೿ͷํ͸͓· ͍ͪͩ͘͞

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ͨͩ͠ɺςετ͕੒ޭ͠ ͯ΋ৗʹεΫγϣ͔Βಈ ըΛੜ੒͢Δඞཁ͕͋Δ

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ςετ͕੒ޭͯ͠΋d ׂͷΦʔόʔϔου͕͋ Δ UFTUSFDPSEFS

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ϓϩδΣΫτʹΑͬͯ͸Φ ʔόϔουΛݮΒ͢޻෉͕ ඞཁ͔΋ ྫಈըࡱӨΛ GMBLZͳςετ͚ͩΛର৅ ʹ͢Δ

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·ͱΊ

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࿩ͨ͜͠ͱ w fl BLZςετͰফ໣͢ΔͷΛ࢓૊ΈͰղܾ͍ͨ͠ w fl BLZςετΛ๷͙࢓૊Έ w &&ςετͰΫϦοΫ࣌ʹը૾ىҼͰཁૉ͕ಈ͔ͳ͍Α͏ʹ ଴ͭ࢓૊ΈΛಋೖ DBQZCBSBXBJU@JNBHF w fl BLZςετΛָʹௐࠪ͢Δ࢓૊Έ w ςετࣦഊ࣌ͷΈϩάΛग़ྗ͢Δ࢓૊Έ DJ@MPHHFS w ςετࣦഊ࣌ʹಈըͰϒϥ΢βͷڍಈΛ֬ೝͰ͖Δ࢓૊Έ DBQZCBSBQMBZXSJHIUESJWFS UFTUSFDPSEFS