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

Transcript

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

   View Slide

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

   View Slide

3. ίʔυΧόϨοδܭଌͯ͠·͔͢ʁ
   3
   

   View Slide

4. • ΧόϨοδ͸100%ͳΒ

   શ෦ςετͰ͖͍ͯͯେৎ෉ɺ

   

   Ͱ͸ͳ͍…ʂ
   

   View Slide

5. ΧόϨοδͷछྨʹΑΔ໰୊
   

   View Slide

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

   View Slide

7. εςʔτϝϯτΧόϨοδ
   • ໋ྩจͷ௨ա཰
   

   View Slide

8. x: 2, y: 2ͷ1έʔεͰΧόϨοδ100%
   

   View Slide

9. ϒϥϯνΧόϨοδ
   • ෼ذͷ໢ཏ཰
   

   View Slide

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

    View Slide

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

    View Slide

12. x: 0, y: 0͸ͳͯ͘΋100%
    

    View Slide

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

    View Slide

14. ΧόϨοδͰ͸
    ݟΔ͜ͱ͕Ͱ͖ͳ͍໰୊
    

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

19. 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
    

    View Slide

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

    View Slide

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

    View Slide