コードカバレッジとの付き合い方を知ってテストを書く

by Daiki Katayama

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ίʔυΧόϨοδͱͷ෇͖߹͍ํ Λ஌ͬͯςετΛॻ͘ 2019/04/10 Otemachi.swift #3 kariad/͔Γ͋Ͳ(@kariad_uu) 1

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ࣗݾ঺հ • kariad / @kariad_uu • ยࢁ େथ • ΦΠγοΫεɾϥɾେ஍ iOS App Developer • / / V / ςετ / ઃܭ 2

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ίʔυΧόϨοδܭଌͯ͠·͔͢ʁ 3

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• ΧόϨοδ͸100%ͳΒ  શ෦ςετͰ͖͍ͯͯେৎ෉ɺ    Ͱ͸ͳ͍…ʂ

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ΧόϨοδͷछྨʹΑΔ໰୊

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ΧόϨοδʹ͸छྨ͕͋Δ • εςʔτϝϯτΧόϨοδ(C0) • ϒϥϯνΧόϨοδ(C1) • ίϯσΟγϣϯΧόϨοδ(C2)౳

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εςʔτϝϯτΧόϨοδ • ໋ྩจͷ௨ա཰

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x: 2, y: 2ͷ1έʔεͰΧόϨοδ100%

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ϒϥϯνΧόϨοδ • ෼ذͷ໢ཏ཰

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(x: 2, y: 2), (x: 0, y: 0)ͷ2έʔεͰΧόϨοδ100%

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• εςʔτϝϯτΧόϨοδ͸Ͳͷ ifจʹ΋ೖΒͳ͍ೖྗ͕ͳͯ͘΋ 100% ➡ શ໢ཏͱ͍͏؍఺Ͱ͸࿙Ε͕͋Δ

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x: 0, y: 0͸ͳͯ͘΋100%

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• XcodeͰܭଌͰ͖Δͷ͸εςʔτ ϝϯτΧόϨοδ(ϥΠϯΧό Ϩοδ) • JaCoCo΍Jest͸ϒϥϯνΧόϨο δ͕औΕΔ…

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ΧόϨοδͰ͸ ݟΔ͜ͱ͕Ͱ͖ͳ͍໰୊

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ΧόϨοδ100%Ͱ΋଍Γͳ͍෦෼ ςετͷೖྗ஋͕10ͩͱ৚͕݅5Ҏ্Ͱ΋੒ޭ͢Δ

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• ڥք஋෼ੳ • όά͕ى͖΍͍͢ͷ͸͜͏ݴͬͨ ڥքͷ෦෼ͳͷͰڥքʹண໨͢Δ

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·ͱΊ • ΧόϨοδ100%Λͨͩ໨ࢦͯ͠΋ޮՌ͸൒ݮ • ΧόϨοδͷܭଌํ๏΍ڥք஋Λҙ্ࣝͨ͠ͰՁ ஋ͷ͋ΔςετΛॻ͜͏ • ଍Γ͍ͯΔࣄΛূ໌͸Ͱ͖ͳ͍͕ɺ଍Γ͍ͯͳ͍ ࣄ͸ূ໌Ͱ͖ΔͨΊɺΧόϨοδΛܭଌ͢Δ͜ͱ ͸େࣄ

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ٕज़ॻయ6 ͚11 https://techbookfest.org/event/tbf06/circle/54660004

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ͳͥεςʔτϝϯτΧόϨοδ ͚ͩͳͷ͔ • AppleͷυΩϡϝϯτʹ͸  ʮCode coverage in Xcode is a testing option supported by LLVMʯ ➡ ΧόϨοδऔಘ͸LLVMͷػೳ https://developer.apple.com/library/archive/documentation/DeveloperTools/ Conceptual/testing_with_xcode/chapters/07-code_coverage.html

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ClangͷυΩϡϝϯτʹ͸ҎԼͷ 4͕ͭܭଌͰ͖Δͱॻ͍ͯ͋Δ • Function coverage • Instantiation coverage • Line coverage • Region coverage ClangͰ৭ʑऔΕΔͳΒಉ͡LLVM࢖͏SwiftͰ΋औΕͳ͍͔ͳ… https://clang.llvm.org/docs/SourceBasedCodeCoverage.html

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https://llvm.org/docs/ CoverageMappingFormat.html https://llvm.org/docs/CommandGuide/llvm- cov.html ͦͷଞࢀߟURL