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Clean Test Code Revised

Clean Test Code Revised

Rails Developer Meetup 2019での発表資料です!可読性の高いテストコードを書くためのコツについて話しました

Shinichi Maeshima

March 23, 2019
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  1. Clean Test Code
    Revised
    @willnet

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  2. Έͳ͞Μ
    ςετॻ͍ͯ·͔͢ʁ

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  3. ͜͜Ͱશһख্͕͕
    Δ༧ఆ✋

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  4. ςετॻ͘ͷָ͍͠
    ਓʁ

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  5. ͜͜Ͱશһ͕໨Λ෬
    ͤΔ༧ఆ

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  6. Ͳ͏͍͏ͱ͖ʹͭΒ͍ʁ
    w ͨ·ʹ$*͚ͩͰίέΔςετ
    w ͳʹΛͲ͏ςετͯ͠Δͷ͔Θ͔Βͳ͍ςετίʔυͷղ

    w ςετͷఆٛΛҰͭมߋͨ͠Βେྔͷ

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  7. Ͳ͏͍͏ͱ͖ʹͭΒ͍ʁ
    w ͨ·ʹ$*͚ͩͰίέΔςετ
    w ͳʹΛͲ͏ςετͯ͠Δͷ͔Θ͔Βͳ͍ςετίʔυͷղ

    w ςετͷఆٛΛҰͭมߋͨ͠Βେྔͷ
    طଘͷςετίʔυ
    मਖ਼͕ͭΒ͍

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  8. Ͳ͏͍͏ͱ͖ʹͭΒ͍ʁ
    w ͨ·ʹ$*͚ͩͰίέΔςετ
    w ͳʹΛͲ͏ςετͯ͠Δͷ͔Θ͔Βͳ͍ςετίʔυ
    w ఆٛΛҰͭมߋͨ͠Βେྔͷ
    A
    ࠓ೔࿩͢͜ͱ

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  9. Մಡੑͷߴ͍ίʔυΛ
    मਖ਼͢ΔͳΒਏ͘ͳ͍͸ͣʜ

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  10. 8F`SFOPUIJSJOH
    ҎલɺՄಡੑͷߴ͍
    ςετίʔυͷॻ͖ํ
    ʹ͍ͭͯ࿩͠·ͨ͠
    https://speakerdeck.com/willnet/clean-test-code

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  11. 3BJMT%FWFMPQFST
    .FFUVQ
    ӫ͑͋ΔୈҰճ໨ʂ

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  12. ൃද͔Β೥ܦͪ
    ಄͕੔ཧ͞Ε͖ͯͨͷͰ΋ͬ
    ͱ͍͍ײ͡ͷઆ໌͕Ͱ͖ͦ͏

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  13. ͔͜͜Βຊ୊

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  14. ࠓ೔͸$MFBO5FTU
    $PEF Մಡੑͷߴ͍ς
    ετίʔυ
    ʹ͍ͭͯ
    ࿩͠·͢

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  15. Ͳ͏͍͏ঢ়ଶͩͱ
    ʮՄಡੑͷߴ͍ςετ
    ίʔυʯͱݴ͑Δͷ͔

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  16. ཧ૝ͷ͕࢟Θ͔Βͳ͍
    ͱमਖ਼͠Α͏͕ͳ͍ʜ

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  17. ೴ʹෛ୲Λ͔͚ͳ͍
    ςετίʔυ͸Մಡੑ
    ͕ߴ͍

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  18. ๻ͨͪ͸ςετίʔυ
    ΛಡΉͱ͖ɺςετͷ
    ಺༰Λ೴಺ϝϞϦʹల
    ։͍ͯ͠Δ

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  19. ೴಺ϝϞϦʹల։͍ͯ͠Δ
    ཁૉ
    w ςετͷ֓ཁ
    w ςετͷࣄલ৚݅
    w खଓ͖
    w ظ଴͍ͯ͠Δ݁Ռ

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  20. αϯϓϧίʔυ

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  21. ֓ཁ
    6TFSGVMMOBNF͕੏ͱ໊Λ͋Θͤͨ΋ͷΛ
    ฦ͢͜ͱΛςετ͍ͯ͠Δ

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  22. લఏ৚݅
    pSTUOBNF͕`ਅҰ` MBTUOBNF͕`લౡ`ͷ
    6TFSΦϒδΣΫτΛੜ੒͠ɺVTFSͰࢀরͰ͖ΔΑ͏ʹ͍ͯ͠Δ

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  23. खଓ͖
    VTFSGVMMOBNFΛ࣮ߦ͢Δ

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  24. ظ଴͢Δ݁Ռ
    bલౡਅҰ`͕໭Γ஋ͱͯ͠ฦΔ

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  25. ςετίʔυ͔Β
    ΁ͷϚοϐϯά

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  26. ͜ΕΒΛ͢ΜͳΓల։͞
    ͤͳ͍ཁૉ͕ଘࡏ͢Δ

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  27. ೴ʹෛ୲Λ͔͚Δཁૉ
    Λഉআͨ͠ςετίʔ
    υ͸Մಡੑ͕ߴ͍

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  28. ೴ʹෛ୲Λ͔͚Δཁૉ
    ͱ͸

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  29. ೴ʹෛ୲Λ͔͚Δཁૉ
    w આ໌ෆ଍
    w είʔϓʹϊΠζ͕͍ࠞͬͯ͟Δ
    w είʔϓͷඈͼ஍
    w ҉໧తͳґଘ͕͋Δ
    w ఆٛΛ్தͰมߋ͢Δ

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  30. આ໌ෆ଍

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  31. આ໌ෆ଍
    w EFTDSJCF DPOUFYU JUͷઆ໌͕ࡶɺ΋͘͠͸આ໌͕ͳ͍
    w ςετͷ֓ཁ͕͙͢ʹ͔ͭΊͣɺ೴ͷϦιʔεΛফඅ͢Δ

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  32. View Slide

  33. EFTDSJCF΍DPOUFYU͕୯ޠ͚ͩ
    JUͷઆ໌͕লུ
    ͳʹΛͲ͏ςετ͍ͯ͠Δͷ͔͙͢ʹ͸Θ͔Βͳ͍

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  34. View Slide

  35. จষΛಡΉ͚ͩͰ
    ֓ཁ͕͙͢ʹΘ͔Δʂ

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  36. ཧ૝͸EFTDSJCF
    DPOUFYU JUΛಡΊ͹ςε
    τͷྲྀΕΛཧղͰ͖Δ͜ͱ

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  37. ݱ৔ͷςετίʔυͰ͸
    JUͷઆ໌͕লུ͞Ε͕ͪ

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  38. ॻ͍ͨຊਓʹͱͬͯ͸ࣗ
    ໌͔΋͠Εͳ͍͚Ͳɺ
    ޙੈͷਓ͕ͭΒ͍ͷͰ
    ৄ͘͠ॻ͖·͠ΐ͏

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  39. JUͷઆ໌Λলུͯ͠Α͍ͷ͸ɺϫϯϥΠφʔܗ
    ࣜͰ͔ͭTVCKFDUͱϚονϟ͕୯७ͳ΋ͷ͚ͩ

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  40. ·ͱΊ
    ςετ͸આ໌͗͢͠
    ͘Β͍Ͱͪΐ͏ͲΑ͍

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  41. είʔϓʹϊΠζ͕ࠞ
    ͍ͬͯ͟Δ

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  42. ͜͜Ͱ͍͏είʔϓͱ͸
    ֘౰͢Δςετʹؔ܎͢Δ
    ϒϩοΫͷ͜ͱͰ͢

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  43. ͷείʔϓ

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  44. ͷείʔϓ

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  45. ྫCͱDͰ͚ͩ࢖͏
    ఆ͕ٛ͋Δ

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  46. %3:ʹ͢ΔͨΊʹ
    Ұ্ͭʹҠಈ

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  47. %3:ʹ͢ΔͨΊʹ
    Ұ্ͭʹҠಈ
    (

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  48. %3:ʹ͢ΔͨΊʹ
    Ұ্ͭʹҠಈ
    ͜ͷఆٛ͸ࠓݟ͍ͯΔε
    ίʔϓͰ࢖ΘΕ͍ͯΔͷ
    ͔ʁ࢖ΘΕ͍ͯͳ͍ͷ
    ͔ʁͱ͍͏൑அ͕ඞཁʹ
    ͳΓ೴ͷϦιʔεΛফඅ
    ͢Δ

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  49. MFUΛMFUʹ͢Δͱ஗ԆධՁͰ`B`ͷίϯς
    ΩετͰ͸࣮ߦ͞Εͳ͍͔ΒΑ͍ͷͰ͸ʁ

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  50. MFUΛMFUʹ͢Δͱ஗ԆධՁͰ`B`ͷίϯς
    ΩετͰ͸࣮ߦ͞Εͳ͍͔ΒΑ͍ͷͰ͸ʁ
    (

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  51. MFUΛMFUʹ͢Δͱ஗ԆධՁͰ`B`ͷίϯς
    ΩετͰ͸࣮ߦ͞Εͳ͍͔ΒΑ͍ͷͰ͸ʁ
    MFUͷ஗Ԇ࣮ߦʹΑͬͯϚ
    γϯ্Ͱ࣮ߦ͞Εͳͯ͘
    ΋೴ͷϝϞϦ͸ফඅ͞Ε
    Δ

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  52. MFUͱMFUͲͪΒͰ΋
    ྑ͍৔߹͸MFU

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  53. ·ͱΊ
    είʔϓʹ͸࢖͏΋ͷ
    ͚ͩΛఆٛ͢Δ

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  54. είʔϓͷඈͼ஍

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  56. ΤσΟλΛεΫϩʔϧ
    ͍ͯ͠Δؒʹ೴಺ϝϞ
    Ϧ͕شൃ͕ͪ͠

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  57. ͜ͷྫ͸͏·͍
    ղܾࡦ͕ͳ͍ʼʻ
    ͋Μ·ΓͭΒ͍Α͏ͳΒ
    ωετΛ΍ΊΔͷ͕Αͦ͞͏

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  59. ผϑΝΠϧͷఆٛΛߦͬͨΓ
    དྷͨΓ͍ͯ͠Δؒʹ೴಺ϝϞ
    Ϧ͕شൃ͕ͪ͠

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  60. ϑΝΠϧதͰ͔͠࢖͍ͬͯͳ͍
    ϔϧύϝιουͳΒ͜͏͍ͨ͠

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  61. ·ͱΊ
    είʔϓͷඈͼ஍ΛͰ͖Δݶ
    ΓݮΒ͢ɻ΍ΉΛಘͳ͍ͱ͖
    ΋ͳΔ΂ۙ͘͘ʹ഑ஔ͢Δ

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  62. ҉໧తͳґଘ

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  63. TUBUVT͸SFBEZEPJOHEPOFͷҰํ޲͔͠ભҠͰ͖ͳ͍
    ͦΕҎ֎ͷભҠΛ͠Α͏ͱͨ͠ΒΤϥʔͱ͍͏࢓༷

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  64. View Slide

  65. TUBUVTͷσϑΥϧτ͕SFBEZͰ͋Δ͜ͱʹґଘ͍ͯ͠Δ͕ɺ
    ςετίʔυ୯ମΛΈ͚ͨͩͰ͸ؾ͚ͮͳ͍

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  66. TUBUVTͷσϑΥϧτ͕SFBEZͰ͋Δ͜ͱʹґଘ͍ͯ͠Δ͕ɺ
    ςετίʔυ୯ମΛΈ͚ͨͩͰ͸ؾ͚ͮͳ͍
    ΋ͪΖΜςετέʔε͕଍Γͳ͍
    ͱ͍͏ͷ΋͋Δ͚ͲͦΕ͸ஔ͍͓͍͍ͯͯͩ͘͞

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  67. ςετίʔυதʹॻ͔Ε
    ͍ͯͳ͍҉໧తͳ৚݅
    FYGBDUPSZ@CPUͷσ
    ϑΥϧτ஋
    ʹґଘͨ͠
    ίʔυΛॻ͘ͱɺࣄલ৚
    ݅ͷ೺Ѳ͕೉͘͠ͳΔ

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  68. ࣄલ৚݅Λਖ਼͘͠೺ѲͰ͖
    ͳ͍ঢ়ଶͰςετίʔυΛ
    ॻ͘ͱɺಡΈͮΒ͍ෆ҆ఆ
    ͳςετίʔυʹͳΔ

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  69. ΋ͪΖΜσϑΥϧτ஋Λ
    มߋͨ͠Βͱ͍͏ͷ΋͋Δ

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  70. ඞཁͷͳ͍ϊΠζ

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  71. ͋Δ΂͖࢟

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  72. ͖ͬ͞΋ݴ͚ͬͨͲ
    େࣄͳ͜ͱͳͷͰ
    ΋͏Ұ౓

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  73. ςετʹؔ܎͍ͯ͠Δ
    ஋Λɺςετίʔυ֎
    ʹॻ͘ͱͭΒ͍

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  74. ͭΒ͍

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  75. ςετʹؔ܎͍ͯ͠Δ
    ஋Λɺςετίʔυ্
    Ͱաෆ଍ͳ͘໌ࣔతʹ
    ࢦఆ͢ΔͱಡΈ΍͍͢

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  76. ͜ͷதʹ͢΂ͯΛॻ͍͍ͯͩ͘͞ʂ

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  77. ͱ͸͍͑ɺ
    'BDUPSZ#PUͷσϑΥ
    ϧτ஋ʹґଘͨ͠ίʔ
    υ͸ॻ͍ͯ͠·͍͕ͪ

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  78. ਪ঑ϓϥΫςΟε
    ʮσϑΥϧτ஋Λϥϯ
    μϜʹ͢Δʯ

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  79. ඞཁͳ஋ͷઃఆʹෆ଍͕͋Δͱ
    ͱ͖Ͳ͖ςετ͕ίέΔΑ͏ʹͳΔ

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  80. 2ϥϯμϜʹ͢Δͱ
    ςετ͕ίέͨͱ͖ʹ
    ࠶ݱͰ͖ͳ͘ͳ͍ʁ

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  81. "ςετ͕ίέͨͱ͖
    ͸ASTQFDŠTFFE
    AͷΑ͏ʹTFFE
    ஋Λࢦఆ͢Δͱ࠶ݱͰ
    ͖Δ

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  82. ·ͱΊ
    ςετʹؔ࿈͍ͯ͠Δ஋
    ΛͳΔ΂͘ςετίʔυ
    ಺ʹدͤͯදݱ͢Δɻա
    ෆ଍͕ͳ͍Α͏ʹ͢Δ

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  83. ఆٛΛ్தͰมߋ͢Δ

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  84. View Slide

  85. ҉໧ͷґଘ

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  86. ͜Εʹґଘͨ͠ςετίʔυ͕͢Ͱʹଘࡏ͢Δͱ
    ͜ͷఆٛΛมߋ͠ʹ͘͘ͳΔ

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  87. ґଘΛͦͷ··࢖ͬͯ
    ແཧ΍ΓςετΛॻ͍ͨྫ

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  88. σϑΥϧτ஋͕໌ࣔతͰͳ͍
    ͷͰɺGBDUPSZͷϑΝΠϧͱ
    ςετͷϑΝΠϧΛߦͬͨΓདྷͨΓ
    ͢Δඞཁ͕͋Δ

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  89. ಈతʹσϑΥϧτ஋Λ
    ม͑Δͱ࠷ऴతͳ஋͕
    ෼͔ΓͮΒ͘ͳΔ

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  90. USBJUΛ࢖͍ɺσϑΥϧτͰ͸
    QPTU͕࡞ΒΕͳ͍Α͏ʹมߋ

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  91. ґଘ͍ͯ͠Δ΋ͷΛ໌ࣔతʹͯ͠
    ςετίʔυຊମʹॻ͘͜ͱ͕Ͱ͖ͨ

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  92. ྫΛ΋͏গ͠

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  93. View Slide

  94. ֎ଆͷείʔϓͰఆٛͨ͠QPTUΛVQEBUF͍ͯ͠ΔͷͰɺ
    ೴಺NFSHF͕ඞཁ

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  95. ͦΕͧΕͷείʔϓͰ໌ࣔతʹQPTUΛఆٛͨ͠΄͏͕
    Θ͔Γ΍͍͢

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  96. View Slide

  97. ֎ଆͷMFUͰఆٛͨ͠QVCMJTI@BUΛ্ॻ͖ͨ͠Γ
    ͍ͯ͠ͳ͔ͬͨΓ͢ΔͷͰɺ೴಺ϑΟϧλϦϯά͕ඞཁ

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  98. σϑΥϧτͷMFUΛ΍Ίͯ
    ͦΕͧΕͷDPOUFYUͰ໌ࣔతʹఆٛ͢Δͱ
    ೴಺ϑΟϧλϦϯά͕ෆཁʹͳΔ

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  99. ֎ଆͷείʔϓͰఆٛ
    ͨ͠΋ͷΛ಺ଆͷε
    ίʔϓͰߋ৽͢Δͱ೴
    ʹෛ୲͕͔͔Δ

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  100. ·ͱΊ
    ςετͷલఏ৚݅Λ্
    ॻ͖ͨ͠Γमਖ਼ͨ͠Γ
    ͠ͳ͍

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  101. ೴ʹෛ୲Λ͔͚Δཁૉ
    ʹ͍ͭͯҰ௨Γ࿩ͨ͠

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  102. ೴ʹෛ୲Λ͔͚Δཁૉ ࠶ܝ

    w આ໌ෆ଍
    w είʔϓʹϊΠζ͕͍ࠞͬͯ͟Δ
    w είʔϓͷඈͼ஍
    w ҉໧తͳґଘ͕͋Δ
    w ఆٛΛ్தͰมߋ͢Δ

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  103. ೴ʹෛ୲Λ͔͚Δཁૉ
    Λෳ਺ؚΈ͕ͪͳ΋ͷ
    ͕͋Δ

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  104. ͦΕ͸ʜ

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  105. TIBSFE@DPOUFYU
    TIBSFE@FYBNQMFT

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  106. ͜ΕͰۤ͠ΜͩPS
    ۤ͠ΜͰ͍Δਓ✋

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  107. %3:ʹ͍ͨ͠ཉٻ͕
    TIBSFE଒Λঌש͢Δ

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  108. TIBSFE଒Λ࢖͏ͳ
    Βɺ͜Ε·Ͱ࿩ͨ͠ϓ
    ϥΫςΟεΛͰ͖Δ͔
    ͗Γ੝ΓࠐΈ·͠ΐ͏

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  109. View Slide

  110. આ໌͕଍Γͳ͍

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  111. Ṗͷґଘؔ܎

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  112. TIBSFE@FYBNQMFTͷఆٛͱ
    ςετίʔυΛߦͬͨΓདྷͨ
    Γͯ͠ɺ೴಺Ͱ
    ʮTIBSFE@FYBNQMFTΛ࢖Θ
    ͳ͔ͬͨͱ͖ͷίʔυʯʹม
    ׵͠ͳ͍ͱͳʹ΋Θ͔Βͳ͍

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  113. मਖ਼Ҋ

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  114. આ໌Λৄͯ͘͠͠
    ςετίʔυ಺͚ͩͰ֓ཁΛ͔ͭΊΔΑ͏ʹͨ͠

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  115. ͔͠͠Ҿ਺ʹظ଴͢Δ݁ՌΛ౉ͯ͠ಈతʹJUͷ಺༰Λมߋ͢Δ
    ͱ͍͏͜ͱࣗମ͕ՄಡੑΛଛͶ͍ͯΔ
    ݁ہఆٛΛಡΜͰ೴಺Ϛʔδͷඞཁ͕͋Δ

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  116. ΂ͨॻ͖ʹͯ͠Έͨ

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  117. ݟ΍͘͢ͳ͕ͬͨ
    ιʔείʔυߦ਺͸૿͑ͨ

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  118. όϥϯεΛ
    ߟ͑·͠ΐ͏

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  119. Լखʹ෼͚Δ͘Β͍ͳ
    ΒίϐϖͰ΂ͨॻ͖ͷ
    ΄͏͕ίετ௿͍Ͱ͢

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  120. શମͷ·ͱΊ
    w Մಡੑͷߴ͍ςετͷॻ͖ํʹ͍ͭͯઆ໌͠·ͨ͠
    w ςετίʔυ͸ΞϓϦέʔγϣϯίʔυͱͪΐͬͱ͚͓ͩ
    ࡞๏͕ҧ͏
    w ΞϓϦέʔγϣϯίʔυ΄ͲՄಡੑ͕ߟྀ͞Ε͍ͯͳ͍ง
    ғؾ
    w ςετίʔυ΋ΞϓϦέʔγϣϯΛߏ੒͢ΔίʔυͷҰ෦
    ͳͷͰɺಡΈ΍͍͢ίʔυʹ͍͖ͯ͠·͠ΐ͏Ͷ

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  121. ͕࣌ؒ༨ͬͨΒ
    ࣗݾ঺հ

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  122. Shinichi Maeshima
    !
    "
    #
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