KotlinTest で始める Property-based Testing/kotlintest-property-based-testing

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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest Ͱ࢝ΊΔ Property-based

   Testing Yusuke Hosonuma @DeNA Kotlin Fest 2019
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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Yusuke Hosonuma @DeNA

   Swift / Haskell / Go Twitter @tobi462
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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. SoftWare Engineer in

   Test ςετࣗಈԽʢiOS / Android / Goʣ CI/CDɺςετٕज़ͷݚڀ
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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࣥච $PNNJOH
   TPPOʜ

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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Agenda • KotlinTest

   ͬͯʁ • Property-based Testing ͬͯʁ • ͲΜͳͱ͖ʹ࢖͑Δʁ • ·ͱΊ ͳΜͱͳ͘ཧղ͕ΰʔϧ
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   KotlinTest ͬͯʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͣ

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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest

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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest ଟ͘ͷػೳΛαϙʔτ͢Δ ςεςΟϯάϑϨʔϜϫʔΫ

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   Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςεςΟϯάελΠϧ String Spec

   Behavior Spec Feature Spec #%%
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ϚονϟʔAPI ʴ

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςʔϒϧۦಈςετ σʔλΛࣄલʹྻڍ

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςʔϒϧۦಈςετ σʔλΛࣄલʹྻڍ ΘΓͱશ෦੝Γͳ

    ςεςΟϯάϑϨʔϜϫʔΫ ͱ͍͏ҹ৅
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    Property-based Testing ͬͯʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

    ͡Ό͋
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Property-based Testing •

    ςετσʔλΛϥϯμϜʹੜ੒ͤ͞ • ؔ਺͕ຬͨ͢ੑ࣭ʢPropertyʣΛݕূ͢Δ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Property-based Testing •

    ςετσʔλΛϥϯμϜʹੜ੒ͤ͞ • ͦͷؔ਺͕ຬͨ͢ੑ࣭ʢPropertyʣΛݕূ͢Δ ͳΔ΄ͲɺΘ͔ΒΜɻ ྫΛݟͯΈΔ
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    ଍͠ࢉʢʴʣͷ ςετͰൺֱ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

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    Example-based Testing Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ීஈ΍ͬͯΔ

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 1 + 1

    = 2 / 2 + 3 = 5 class AddSpec: StringSpec({ "add" { forall( row(1, 1, 2), row(2, 3, 5) ) { a, b, expected -> (a + b) shouldBe expected } } })
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. class AddSpec: StringSpec({

    "add" { forall( row(1, 1, 2), row(2, 3, 5) ) { a, b, expected -> (a + b) shouldBe expected } } }) ೖྗ஋ͱظ଴஋Λ༻ҙͯ͠ 1 + 1 = 2 / 2 + 3 = 5
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. class AddSpec: StringSpec({

    "add" { forall( row(1, 1, 2), row(2, 3, 5) ) { a, b, expected -> (a + b) shouldBe expected } } }) ݁Ռͱظ଴஋͕Ұக͢Δ͔ʁ 1 + 1 = 2 / 2 + 3 = 5
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    Property-based Testing Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Ͱ͸ʁ

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ੑ࣭Λߟ͑Δ a +

    b = b + a ަ׵๏ଇΛຬͨ͢
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ੑ࣭Λߟ͑Δ a +

    b = b + a ʁ ʁ ͲΜͳ஋Ͱ΋੒Γཱͭ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:

    StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } })
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:

    StringSpec({ “commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) ͢΂ͯͷ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:

    StringSpec({ “commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) औΓ͏Δ஋
    B
    ͱ
    C
    ʹ͍ͭͯ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:

    StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) B
    
    C
    
    C
    
    B
    Ͱ͋Δ͜ͱ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:

    StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) B
    
    C
    
    C
    
    B
    Ͱ͋Δ͜ͱ ϥϯμϜͳೖྗ஋ʹରͯ͠ ຬͨ͞ΕΔ΂͖ੑ࣭Λݕূ ৗʹ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. debug print ͯ͠ΈΔͱ

    ཚ਺Ͱ ճࢼߦ͞ΕͯΔ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. debug print ͯ͠ΈΔͱ

    ཚ਺Ͱ ճࢼߦ͞ΕͯΔ ύε͠ͳ͍σʔλ͕ͳ͍͔ େྔͷཚ਺Ͱ͋ͿΓग़͢ ͱߟ͑Δͱ෼͔Γ΍͍͢
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    ͲΜͳ࣌ʹ࢖͑Δʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Ͱ͸

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࢖͍Ͳ͜Ζ 1. ཚ਺Λར༻ͨ͠ΞϧΰϦζϜ

    2. ରশੑͷ͋ΔΞϧΰϦζϜ 3. ߴ଎ vs ௿଎
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    ཚ਺Λར༻ͨ͠ΞϧΰϦζϜ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ໎࿏ੜ੒ • ͲΜͳ໎࿏Ͱ΋ղ͚ͳ͍ͱ੒ཱ͠ͳ͍

    • ʮඞͣղ͚Δʯͱ͍͏ੑ࣭Λݕূ͢Δ
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ໎࿏ੜ੒ • ͲΜͳ໎࿏Ͱ΋ղ͚ͳ͍ͱ੒ཱ͠ͳ͍

    • ٯʹݴ͑͹ղ͚ͳ͍ͱόά • ʮඞͣղ͚Δʯͱ͍͏ੑ࣭Λݕূ͢Δ ྫ͑͹ Monkey Runner ΋ ϥϯμϜͳΠϕϯτΛൃߦ͠ଓ͚ ʮམͪͳ͍ʯੑ࣭Λݕূ͢Δ "OESPJE
    ͷ
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    ରশੑͷ͋ΔΞϧΰϦζϜ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Τϯίʔυ / σίʔυ

    • ͲΜͳ஋ΛΤϯίʔυ → σίʔυ ͯ͠΋ • ඞͣʮݩͷ஋ʹ໭Δʯͱ͍͏ੑ࣭Λݕূ
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    ߴ଎ vs ௿଎ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

    
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ߴ଎ vs ௿଎

    • ߴ଎ͳίʔυ͸଎͍ʢ͚Ͳෳࡶʣ • ௿଎ͳίʔυ͸໌നʢ͚Ͳ஗͍ʣ • ͲͪΒ΋ʮಉ݁͡ՌʹͳΔʯͱ͍͏ੑ࣭Λར༻ • લऀͷݕূʹޙऀΛར༻͢Δ
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    ·ͱΊ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͱΊ • KotlinTest

    ͸ ςεςΟϯάϑϨʔϜϫʔΫ • Property-based Testing ΋αϙʔτ • ϥϯμϜͳೖྗΛݩʹੑ࣭Λݕূ • Example-based Λஔ͖׵͑Δ΋ͷͰ͸ͳ͍
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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͱΊ • KotlinTest

    ͸ DSL Λ׆༻ͨ͠ςετϥΠϒϥϦ • Property-based Testing ΋αϙʔτ • ϥϯμϜͳೖྗΛݩʹੑ࣭Λݕূ • Example-based Λஔ͖׵͑Δ΋ͷͰ͸ͳ͍ ͱ͖ͬͭͮΒ͍ߟ͑ํ͕ͩ ͓֮͑ͯ͘ͱڧྗͳΧʔυ ࠷ॳ͸
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    એ఻ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͲͳͨͰ΋ొஃ0,ʂ

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    Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͲͳͨͰ΋ొஃ0,ʂ DeNA ʹͯ

    9/9ʢ݄ʣ 19:00 ʙ
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    Let’s try Property-based Testing Copyright (C) DeNA Co.,Ltd. All Rights

    Reserved. XJUI
    ,PUMJO5FTU