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費用対効果の高いテストコードを書くために意識したこと.pdf
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Kaoru Hotate
December 16, 2019
Programming
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費用対効果の高いテストコードを書くために意識したこと.pdf
2019/12/16 年末だよ Android/iOS Test Night - 2019
https://testnight.connpass.com/event/155429/
Kaoru Hotate
December 16, 2019
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Transcript
අ༻ରޮՌͷߴ͍ ςετίʔυΛॻͨ͘Ίʹߟ͑ͨ͜ͱ ,BPSV)PUBUF!QVSVOLBPSV ͩΑ"OESPJEJ045FTU/JHIU UFTU@OJHIU 1
อཱ֜ ,BPSV)PUBUF 5XJUUFS!QVSVOLBPSV ϝυϐΞגࣜձࣾ ‣ 3VCZ ‣ J04
‣ "OESPJEϲ݄ ࣗݾհ 2
͖͔͚ͬ 3 6OJU5FTU͔Βॻ͍͍ͯ͜͏ .PEFM7JFX.PEFM͔Β ॻ͖·͠ΐ͏ ॻ͚ΔՕॴ͔Βॻ͍͍ͯ͜͏ όάͷଟ͍Օॴ͔Βॻ͜͏ શ෦ਖ਼ͦ͠͏ ˞ͦͷϓϩδΣΫτͷঢ়گͰ
͖͔͚ͬ 4 ςετͷʮԿΛΔ͔ʯʮԿ͔ΒΔ͔ʯɺ ϓϩδΣΫτʹΑͬͯҟͳΔͷͰʁ ‣ ΞϓϦͷۀछɾαʔϏεͷ༰ ‣ ϓϩμΫτϥΠϑαΠΫϧ ‣ खಈςετͰͷ୲อͷํ
ςετίʔυΛॻ͘త͔Βɺ ͲͷςετΛॻ͖͔͘அ͠ͳ͍ͱɺ ςετͷఆண࣮ݱͰ͖ͳͦ͞͏
ࠓ͢͜ͱ 5 ͕୲͍ͯ͠ΔαʔϏεʹɺ ͔ΒςετίʔυΛॻ͘͜ͱʹͳΓ·ͨ͠ ʮඅ༻ରޮՌͷߴ͍ςετίʔυʯͱԿ͔ʁʹ͍ͭͯߟ͑ɺ ࣮ફͨ݁͠Ռىͬͨ͜͜ͱΛ͠·͢
ΞδΣϯμ 6 ϓϩδΣΫτͷঢ়گΛѲ͢Δ ςετίʔυͷతΛߟ͑Δ ςετίʔυͷํΛ·ͱΊΔ ࣮ࡍʹى͖ͨ͜ͱΛৼΓฦΔ
͓ͼ 7 ͷ༰্ɺࣗͷϓϩδΣΫτͷઆ໌͕ଟ͘ͳ͍ͬͯ·͢ ڵຯͳ͍ਓ͍Βͬ͠ΌΔͱࢥ͍·͕ྃ͢͝ঝ͍ͩ͘͞
ϓϩδΣΫτͷঢ়گΛѲ͢Δ 8
αʔϏεઆ໌ 9
ͬ͘͟Γͷػೳઆ໌ 10 B ձһొɾϩάΠϯػೳ C ΧϝϥͰࡱӨͨ͠ॲํᝦͷૹ৴ػೳ D ϓογϡ௨डऔΓػೳ E νϟοτϝοηʔδૹड৴ػೳ
"OESPJE.77.Λ࠾༻ 7JFX7JFX.PEFM3FQPTJUPSZ.PEFM
αʔϏεͷϓϩμΫτϥΠϑαΠΫϧ 11 IUUQTCJ[IJOUKQLFZXPSEΑΓ ͜ͷลʁ ˞͋͘·ͰϓϩδΣΫτͰͷओ؍తͳҙݟͰ͢
ςετίʔυͷతΛߟ͑Δ 12
13 ςετΛॻͭ͘ͷత Jਖ਼͘͠ಈ͘͜ͱΛ୲อ͢Δ JJ։ൃ࣌ͷಈ࡞ݕূΛ͘͢Δ JJJϨϏϡʔ࣌ؒΛ͘͢Δ JWΤϯδχΞ͕ײ͡Δਫ਼ਆతෛ୲ΛݮΒ͢ ˞ίʔυͷ࣭Λ୲อ͢Δɾ༷Λ໌จԽ͢ΔͳͲɺଞͷཧ༝ߟ͑ΒΕΔ͕ɺ ςετΛॻ͘෭࣍తͳϝϦοτͩͱߟ͑ͨͷͰɺআ֎͍ͯ͠·͢
Jਖ਼͘͠ಈ͘͜ͱΛ୲อ͢Δ 14 త ‣ όά͕ϦϦʔε͞ΕΔ֬ΛݮΒ͢ ‣ όάൃੜʙमਖ਼ྃʹ͔͚Δ࣌ؒΛݮΒ͢ ‣ σάϨΛ͙
ςετίʔυͷಛ ‣ աڈͷόάൃੜසͷߴ͍Օॴ͔Βॻ͘ ‣ ෳࡶͳΫϥεը໘͔Βॻ͘ ‣ ݺͼग़͞ΕΔॲཧ͕ଟ͍Օॴ͔Βॻ͘
Jਖ਼͘͠ಈ͘͜ͱΛ୲อ͢Δ 15 ͲΜͳϓϩδΣΫτʹద͍ͯ͠Δ͔ <>͘ଓ͚Δ༧ఆͷαʔϏεͰ͋Δ <>ҙਤͨ͠ڍಈʹͳΒͳ͍࣌ͷӨڹɾӨڹֹ͕େ͖͍ <>ػೳमਖ਼͕ଟ͍ <>ϥΠϒϥϦͷΞοϓσʔτΛ͢Δස͕ߴ͍ <>2"νʔϜ͕͍ͳ͍ ˓ º
º ˚ ˓
JJ։ൃ࣌ͷಈ࡞ݕূΛ͘͢Δ 16 త ‣ ࣮ػͰͷಈ࡞ݕূ͕໘ͳՕॴʹରͯ͠ɺ ςετίʔυͰͷڍಈ֬ೝΛߦ͏ ‣ ֬ೝ࿙ΕΛ͙ Δ͜ͱ
‣ ಈ࡞ݕূ͕໘ͳ෦ͷ6OJU5FTUΛॻ͘ ΤϥʔॲཧϨΞέʔεͷڍಈ୲อͳͲ
JJ։ൃ࣌ͷಈ࡞ݕূΛ͘͢Δ 17 ͲΜͳϓϩδΣΫτʹద͍ͯ͠Δ͔ <>"1*ͷNPDLڥ͕ͳ͍ <>ෳࡶͳભҠέʔε͕ଟ͍ <>ΤϯδχΞ͕ಈ࡞ݕূΛαϘΓ͕ͪ ˓ ˚ ˚
JJJϨϏϡʔ࣌ؒΛ͘͢Δ 18 త ‣ ϨϏϡʔ࣌ʹɺςετίʔυͰ୲อ͞Ε͍ͯΔՕॴͷ खಈνΣοΫΛߦ͏࣌ؒΛ͘͢Δ Δ͜ͱ ‣ ෳࡶͳॲཧɺݟ͚ͨͩͰࣗ໌Ͱͳ͍Օॴ͔Β6OJU5FTUΛॻ͘
JJJϨϏϡʔ࣌ؒΛ͘͢Δ 19 ͲΜͳϓϩδΣΫτʹద͍ͯ͠Δ͔ <>ϨϏϡʔจԽ͕͋Δ ଞʹཁҼ͋Γͦ͏͚ͩͲɾɾɾ º
JWΤϯδχΞ͕ײ͡Δਫ਼ਆతෛ୲ΛݮΒ͢ 20 త ‣ ϦϦʔε࣌ʹɺΤϯδχΞʹ͔͔ΔաͷۓுΛ΄͙͢ ‣ ςετͰ୲อ͞Ε͍ͯΔͱ͍͏҆৺ײΛ༩͑Δ Δ͜ͱ ‣
ࣦഊ࣌ʹӨڹͷେ͖͍Օॴ͔Βɺ6*5FTU6OJU5FTUΛॻ͘
JWΤϯδχΞ͕ײ͡Δਫ਼ਆతෛ୲ΛݮΒ͢ 21 ͲΜͳϓϩδΣΫτʹద͍ͯ͠Δ͔ <>ҙਤͨ͠ڍಈʹͳΒͳ͍࣌ͷӨڹɾӨڹֹ͕େ͖͍ <>ϦϦʔεલʹυΩυΩ͢Δ <>ϦϦʔεલʹख͕͑Δ <>ϦϦʔεલʹׇ͕͘ ˓ ˓ ˓
˓
ςετίʔυͷํΛ·ͱΊΔ 22
23 ςετΛॻͭ͘ͷత Jਖ਼͘͠ಈ͘͜ͱΛ୲อ͢Δ JJ։ൃ࣌ͷಈ࡞ݕূΛ͘͢Δ JJJϨϏϡʔ࣌ؒΛ͘͢Δ JWΤϯδχΞ͕ײ͡Δਫ਼ਆతෛ୲ΛݮΒ͢
24 ςετΛॻͭ͘ͷత Jਖ਼͘͠ಈ͘͜ͱΛ୲อ͢Δ JJ։ൃ࣌ͷಈ࡞ݕূΛ͘͢Δ JJJϨϏϡʔ࣌ؒΛ͘͢Δ JWΤϯδχΞ͕ײ͡Δਫ਼ਆతෛ୲ΛݮΒ͢
25 ԿΛΔ͔ʢϨΠϠʔ͝ͱͷΓ͚ʣ ਖ਼͘͠ಈ͘͜ͱΛ ୲อ͢Δ ಈ࡞ݕূΛ ͘͢Δ ਫ਼ਆతෛ୲Λ ݮΒ͢ 7JFX ˚
º ˚ 7JFX.PEFM ˓ ˚ ˚ 3FQPTJUPSZ ˓ ˓ ˓ .PEFM ˓ ˚ ˓ 3FQPTJUPSZɺඞͣ6OJU5FTUΛॻ͘ .PEFMɺෳࡶͳ෦͔Β6OJU5FTUΛॻ͘
26 ԿΛΔ͔ʢػೳ͝ͱͷΓ͚ʣ ਖ਼͘͠ಈ͘͜ͱΛ ୲อ͢Δ ಈ࡞ݕূΛ ͘͢Δ ਫ਼ਆతෛ୲Λ ݮΒ͢ ձһొ ˓
˓ ˕ ॲํᝦը૾ૹ৴ ˓ ˚ ˓ ௨डऔΓ ˚ ˓ ˚ ϝοηʔδૹड৴ ˚ ˚ º ʮձһొʯ6*5FTU6OJU5FTUΛཏ͢Δ ʮॲํᝦը૾ૹ৴ʯ6OJU5FTUΛཏ͢Δ
27 ԿΛΔ͔ʢ·ͱΊʣ ্͔Βॱʹߦ͏ J3FQPTJUPSZͷ6OJU5FTUΛॻ͘ JJʮձһొʯͷ6OJU5FTU6*5FTUΛॻ͘ JJJෳࡶͳ.PEFMͷ6OJU5FTUΛॻ͘ JWʮॲํᝦը૾ૹ৴ʯͷ6OJU5FTUΛॻ͘
࣮ࡍʹى͖ͨ͜ͱΛৼΓฦΔ 28
29 ԿΛΔ͔ʢ·ͱΊʣ ্͔Βॱʹߦ͏ J3FQPTJUPSZͷ6OJU5FTUΛॻ͘ JJʮձһొʯͷ6OJU5FTU6*5FTUΛॻ͘ JJJෳࡶͳ.PEFMͷ6OJU5FTUΛॻ͘ JWʮॲํᝦը૾ૹ৴ʯͷ6OJU5FTUΛॻ͘ ձһొϑϩʔม͑Α͏
30 ײͨ͜͡ͱ ಛʹ࠷ॳͷϑΣʔζ͔ΒςετΛॻ͍͍ͯ͘߹ɺ ϏδωεαΠυͱίϛϡχέʔγϣϯΛͱͬͯɺ ࠷ળͷςετํΛࡦఆ͍ͯ͜͠͏ɻ ઌਓͷܙʹԊͬͯɺී௨ʹ࣮͍͚ͯ͠ ͍͍ײ͡ͷςετํ͕ݐͯΒΕͨؾ͕͢Δɻ ςετίʔυΛఆணͤ͞Δͱ͍͏͜ͱΛॏࢹ͢ΔͷͰ͋Εɺ ͳͥΔ͔Λɺ୲ऀ͕͖ͪΜͱཧղ͍ͯ͠Δ͖ɻ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ 31