Kotlin学習とライブラリ作成

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,PUMJOֶशͱϥΠϒϥϦ࡞੒ 2016 03 24 @ Sansan Toshihiro Yagi

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About Me Toshihiro Yagi Twitter : sys1yagi Programmer at Cookpad Inc. Android engineer Kotlin͸2014೥ॳ಄ลΓ͔ΒŧŔŕŪ৮͍ͬͯΔఔ౓

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Target & Agenda ,PUMJOֶशͷͨΊʹϥΠϒϥϦ࡞ͬͯΈΔͷ͸݁ ߏ͍͍Μ͡Όͳ͍͔ͳʔͱ͍͏࿩Ͱ͢ɻ LNPDLJUPͱ͍͏ϥΠϒϥϦͱڞʹ࡞੒࣌ʹ࢖ͬ ͨ,PUMJOͷػೳͳͲΛ঺հ͠·͢ɻ ,PUMJOͷجຊతͳݴޠͷػೳ͸஌͍ͬͯͯ,PUMJO Λ࢖ͬͯ۩ମతʹͲ͏͍ͬͨࣄ͕Ͱ͖ͦ͏͔ͳ͊ʔ ͱߟ͍͑ͯΔਓ޲͚

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What is kmockito?

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Wrapper of Mockito for Kotlin NPDL WBSJUFN*UFNNPDL XIFO JUFNMFOHUI JOWPLFEUIFO3FUVSO BOTXFS JUFNTPNF.FUIPE BOZ*OU BOZ4USJOH BOZ BOZ JOWPLFE UIFO"OTXFS\ WBM B C D E JUBSHVNFOUT*OU 4USJOH *UFN /BNF EPTPNFUIJOH ^ WFSJGZ JUFNWFSJGZ UJNFT MFOHUI https://github.com/sys1yagi/kmockito

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Motivation

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bXIFO`͸,PUMJOͷ༧໿ޠ WBMJUFNNPDL *UFNDMBTTKBWB AXIFOA JUFNMFOHUI UIFO3FUVSO ༧໿ޠͱඃΒͳ͍Α͏ʹΤεέʔϓ͕ඞཁ ৑௕

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BOZ ͕OVMMΛฦ͢ AXIFOA JUFNMFOHUI BOZ UIFO3FUVSO ʜ any() return null and cause runtime error GVOMFOHUI UFYU4USJOH *OU\ʜ^ Non-Null

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Yes kmockito!

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Using features of Kotlin top-level extensions inline and reiﬁed Extension Properties Destructuring Declarations

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top-level extensions

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τοϓϨϕϧʹؔ਺͕ॻ͚ͯศར

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TUBUJDϝιου܈Λ࣋ͭΫϥε͕ੜ੒͞ΕΔ ֦ுؔ਺܈͸XX_extension.ktʹूΊΔͱΑͦ͞͏

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lnline & reified

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৑௕ͳܕͷهड़Λ΍ΊΔ WBMJUFNNPDL *UFNDMBTTKBWB WBMJUFN*UFNNPDL JUFNMFOHUI NPDL

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৑௕ͳܕͷهड़Λ΍ΊΔ GVO5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB

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৑௕ͳܕͷهड़Λ΍ΊΔ GVO5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ

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৑௕ͳܕͷهड़Λ΍ΊΔ GVO5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ JOMJOFGVOSFJpFE5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB

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৑௕ͳܕͷهड़Λ΍ΊΔ GVO5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ JOMJOFGVOSFJpFE5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB JOMJOFԽͯ͠ܕύϥϝʔλʹSFJpFEΛ෇༩͢Δͱ5Λ۩৅ܕͱ͔ͯ͋ͭ͑͠Δ ˞LPUMJOSFqFDU͕ඞཁͰ͢

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৑௕ͳܕͷهड़Λ΍ΊΔ JOMJOFGVOSFJpFE5"OZNPDL .PDLJUPNPDL 5DMBTTKBWB WBMJUFN*UFNNPDL JUFNMFOHUI NPDL :FT

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Extension Properties

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৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO55JOWPLFE .PDLJUPAXIFOA UIJT JUFNMFOHUI JOWPLFE UIFO3FUVSO

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৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO55JOWPLFE .PDLJUPAXIFOA UIJT JUFNMFOHUI JOWPLFE UIFO3FUVSO ͳͯ͘΋Α͘ͳ͍ʁ

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৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO55JOWPLFE .PDLJUPAXIFOA UIJT WBM55JOWPLFE0OHPJOH4UVCCJOH5 HFU JOWPLFE ɾ&YUFOTJPO1SPQFSUJFTͰ೚ҙͷΫϥεʹϓϩύςΟΛ෇༩͢Δ ɾϓϩύςΟΞΫηε࣌ʹϝιουݺͼग़͠

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৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO55JOWPLFE .PDLJUPAXIFOA UIJT WBM55JOWPLFE0OHPJOH4UVCCJOH5 HFU JOWPLFE ɾ&YUFOTJPO1SPQFSUJFTͰ೚ҙͷΫϥεʹϓϩύςΟΛ෇༩͢Δ ɾϓϩύςΟΞΫηε࣌ʹϝιουݺͼग़͠ JUFNMFOHUI JOWPLFEUIFO3FUVSO

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Destructuring Declarations

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85' JUFNTPNF.FUIPE BOZ*OU BOZ4USJOH BOZ BOZ JOWPLFE UIFO"OTXFS\ WBMBJUBSHVNFOUT<>BT*OU WBMCJUBSHVNFOUT<>BT4USJOH WBMDJUBSHVNFOUT<>BT*UFN WBMEJUBSHVNFOUT<>BT/BNF EPTPNFUIJOH ^

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%FTUSVDUVSJOH%FDMBSBUJPOT Λ࢖ͬͨ୅ೖ WBM B C 1BJS l)FMMPz Bl)FMMPz C

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%FTUSVDUVSJOH%FDMBSBUJPOT Λ࢖ͬͨ୅ೖ WBM B C 1BJS l)FMMPz Bl)FMMPz C ಛఆͷϧʔϧʹԊͬͨΫϥεͰ %FTUSVDUVSJOH%FDMBSBUJPOT͕࢖͑Δɻ

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%FTUSVDUVSJOH%FDMBSBUJPOTͷϧʔϧ DMBTT'PP\ PQFSBUPSGVODPNQPOFOU 4USJOHʜ PQFSBUPSGVODPNQPOFOU *OUʜ PQFSBUPSGVODPNQPOFOU/ 5ʜ ^ GVOEP4PNFUIJOH GPP'PP \ WBM B C GPP ʜ ^ DPNQPOFOU/ ͱ͍͏ϝιουΛඞཁͳ਺͚ͩ࣋ͭ

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%BUB$MBTTͰએݴָʑ EBUBDMBTT'PP WBMB4USJOH WBMC*OU GVOEP4PNFUIJOH GPP'PP \ WBM B C GPP ʜ ^ %BUB$MBTTͰলུՄೳ

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*OWPDBUJPO0O.PDLʹϝιουΛ௥Ճ JOMJOFGVOSFJpFE" SFJpFE# SFJpFE$ *OWPDBUJPO0O.PDLBSHVNFOUT 5SJQMF BSHVNFOUT<>BT" BSHVNFOUT<>BT# BSHVNFOUT<>BT$

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*OWPDBUJPO0O.PDLʹϝιουΛ௥Ճ JOMJOFGVOSFJpFE" SFJpFE# SFJpFE$ *OWPDBUJPO0O.PDLBSHVNFOUT 5SJQMF BSHVNFOUT<>BT" BSHVNFOUT<>BT# BSHVNFOUT<>BT$ JUFNTPNF.FUIPE BOZ*OU BOZ4USJOH BOZ JOWPLFE UIFO"OTXFS\ WBM B C D JUBSHVNFOUT*OU 4USJOH *UFN EPTPNFUIJOH ^ :FT

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Conclusion

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,PUMJOֶशͱϥΠϒϥϦ࡞੒ ߦఔ౓Ͱ݁ߏ࢖͑Δ΋ͷ͕࡞ΕΔ ϥΠϒϥϦͩͱ"OESPJEͳͲͷϑϨʔϜϫʔΫ ʹ͋·ΓറΒΕͣॻ͚ΔͷͰֶश͕͸͔ͲΔ େମίʔυ͕ճ͘Β͍ม਎͢ΔɻͦͷதͰ,PUMJO ͷ࢓༷΍ػೳ΍ॻ͖ํͳͲʹ͍ͭͯ৭ʑͱ۷ΕΔ ࠷ѱࣺͯΒΕΔ