Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
KotlinTest で始める Property-based Testing/kotlint...
Search
Yusuke Hosonuma
August 24, 2019
Programming
2
1.5k
KotlinTest で始める Property-based Testing/kotlintest-property-based-testing
Kotlin Fest 2019
https://kotlin.connpass.com/event/129860/
Yusuke Hosonuma
August 24, 2019
Tweet
Share
More Decks by Yusuke Hosonuma
See All by Yusuke Hosonuma
Marzipan の正体は何だったのか そして SwiftUI の衝撃/wwdc19_marzipan_swiftui
yusukehosonuma
2
920
標準パッケージにおけるテストでの利用例から学ぶ testing / quick パッケージ/golang-testing-quick
yusukehosonuma
4
12k
Swift で ParameterizedTest をやってみた話/swift-parameterized-test
yusukehosonuma
4
2.1k
Property-based test beginning with SwiftCheck
yusukehosonuma
1
5.8k
XCTest(再)入門/reintroduction-to-xctest
yusukehosonuma
0
510
ソースコードから読み解く - Quick はどのように実装されているのか?/quick-code-reading
yusukehosonuma
7
11k
Swift 4.2 はどのような進化をしているのか/whats-new-swift42
yusukehosonuma
16
15k
HTTPモックライブラリ「Mockingjay」を使ってみた話/swift-mockingjay
yusukehosonuma
5
3.9k
SwiftにおけるMockライブラリの活用/swift-mock-library
yusukehosonuma
10
6.4k
Other Decks in Programming
See All in Programming
Android端末で実現するオンデバイスLLM 2025
masayukisuda
1
150
テストコードはもう書かない:JetBrains AI Assistantに委ねる非同期処理のテスト自動設計・生成
makun
0
320
Deep Dive into Kotlin Flow
jmatsu
1
340
rage against annotate_predecessor
junk0612
0
170
CloudflareのChat Agent Starter Kitで簡単!AIチャットボット構築
syumai
2
500
Navigation 2 を 3 に移行する(予定)ためにやったこと
yokomii
0
260
Reading Rails 1.0 Source Code
okuramasafumi
0
220
🔨 小さなビルドシステムを作る
momeemt
4
680
Navigating Dependency Injection with Metro
zacsweers
3
960
Ruby Parser progress report 2025
yui_knk
1
440
為你自己學 Python - 冷知識篇
eddie
1
350
Rancher と Terraform
fufuhu
2
400
Featured
See All Featured
Making the Leap to Tech Lead
cromwellryan
135
9.5k
Context Engineering - Making Every Token Count
addyosmani
3
44
Thoughts on Productivity
jonyablonski
70
4.8k
The Cost Of JavaScript in 2023
addyosmani
53
8.9k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Gamification - CAS2011
davidbonilla
81
5.4k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
A designer walks into a library…
pauljervisheath
207
24k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
8
920
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
GraphQLとの向き合い方2022年版
quramy
49
14k
How to train your dragon (web standard)
notwaldorf
96
6.2k
Transcript
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest Ͱ࢝ΊΔ Property-based
Testing Yusuke Hosonuma @DeNA Kotlin Fest 2019
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Yusuke Hosonuma @DeNA
Swift / Haskell / Go Twitter @tobi462
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. SoftWare Engineer in
Test ςετࣗಈԽʢiOS / Android / Goʣ CI/CDɺςετٕज़ͷݚڀ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࣥච $PNNJOHTPPOʜ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Agenda • KotlinTest
ͬͯʁ • Property-based Testing ͬͯʁ • ͲΜͳͱ͖ʹ͑Δʁ • ·ͱΊ ͳΜͱͳ͘ཧղ͕ΰʔϧ
KotlinTest ͬͯʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͣ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTest ଟ͘ͷػೳΛαϙʔτ͢Δ ςεςΟϯάϑϨʔϜϫʔΫ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςεςΟϯάελΠϧ String Spec
Behavior Spec Feature Spec #%%
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ϚονϟʔAPI ʴ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςʔϒϧۦಈςετ σʔλΛࣄલʹྻڍ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ςʔϒϧۦಈςετ σʔλΛࣄલʹྻڍ ΘΓͱશ෦Γͳ
ςεςΟϯάϑϨʔϜϫʔΫ ͱ͍͏ҹ
Property-based Testing ͬͯʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
͡Ό͋
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Property-based Testing •
ςετσʔλΛϥϯμϜʹੜͤ͞ • ͕ؔຬͨ͢ੑ࣭ʢPropertyʣΛݕূ͢Δ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Property-based Testing •
ςετσʔλΛϥϯμϜʹੜͤ͞ • ͦͷ͕ؔຬͨ͢ੑ࣭ʢPropertyʣΛݕূ͢Δ ͳΔ΄ͲɺΘ͔ΒΜɻ ྫΛݟͯΈΔ
͠ࢉʢʴʣͷ ςετͰൺֱ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Example-based Testing Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ීஈͬͯΔ
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 } } })
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 } } }) ೖྗͱظΛ༻ҙͯ͠ 1 + 1 = 2 / 2 + 3 = 5
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 } } }) ݁Ռͱظ͕Ұக͢Δ͔ʁ 1 + 1 = 2 / 2 + 3 = 5
Property-based Testing Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Ͱʁ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ੑ࣭Λߟ͑Δ a +
b = b + a ަ๏ଇΛຬͨ͢
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ੑ࣭Λߟ͑Δ a +
b = b + a ʁ ʁ ͲΜͳͰΓཱͭ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:
StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } })
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:
StringSpec({ “commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) ͯ͢ͷ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:
StringSpec({ “commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) औΓ͏ΔBͱCʹ͍ͭͯ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:
StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) B CC BͰ͋Δ͜ͱ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. KotlinTestͰݕূ class AddProperty:
StringSpec({ "commutative" { assertAll { a: Int, b: Int -> (a + b) shouldBe (b + a) } } }) B CC BͰ͋Δ͜ͱ ϥϯμϜͳೖྗʹରͯ͠ ຬͨ͞ΕΔ͖ੑ࣭Λݕূ ৗʹ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. debug print ͯ͠ΈΔͱ
ཚͰ ճࢼߦ͞ΕͯΔ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. debug print ͯ͠ΈΔͱ
ཚͰ ճࢼߦ͞ΕͯΔ ύε͠ͳ͍σʔλ͕ͳ͍͔ େྔͷཚͰ͋ͿΓग़͢ ͱߟ͑Δͱ͔Γ͍͢
ͲΜͳ࣌ʹ͑Δʁ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Ͱ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͍Ͳ͜Ζ 1. ཚΛར༻ͨ͠ΞϧΰϦζϜ
2. ରশੑͷ͋ΔΞϧΰϦζϜ 3. ߴ vs
ཚΛར༻ͨ͠ΞϧΰϦζϜ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ໎࿏ੜ • ͲΜͳ໎࿏Ͱղ͚ͳ͍ͱཱ͠ͳ͍
• ʮඞͣղ͚Δʯͱ͍͏ੑ࣭Λݕূ͢Δ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ໎࿏ੜ • ͲΜͳ໎࿏Ͱղ͚ͳ͍ͱཱ͠ͳ͍
• ٯʹݴ͑ղ͚ͳ͍ͱόά • ʮඞͣղ͚Δʯͱ͍͏ੑ࣭Λݕূ͢Δ ྫ͑ Monkey Runner ϥϯμϜͳΠϕϯτΛൃߦ͠ଓ͚ ʮམͪͳ͍ʯੑ࣭Λݕূ͢Δ "OESPJEͷ
ରশੑͷ͋ΔΞϧΰϦζϜ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Τϯίʔυ / σίʔυ
• ͲΜͳΛΤϯίʔυ → σίʔυ ͯ͠ • ඞͣʮݩͷʹΔʯͱ͍͏ੑ࣭Λݕূ
ߴ vs Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ߴ vs
• ߴͳίʔυ͍ʢ͚Ͳෳࡶʣ • ͳίʔυ໌നʢ͚Ͳ͍ʣ • ͲͪΒʮಉ݁͡ՌʹͳΔʯͱ͍͏ੑ࣭Λར༻ • લऀͷݕূʹޙऀΛར༻͢Δ
·ͱΊ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͱΊ • KotlinTest
ςεςΟϯάϑϨʔϜϫʔΫ • Property-based Testing αϙʔτ • ϥϯμϜͳೖྗΛݩʹੑ࣭Λݕূ • Example-based Λஔ͖͑ΔͷͰͳ͍
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ·ͱΊ • KotlinTest
DSL Λ׆༻ͨ͠ςετϥΠϒϥϦ • Property-based Testing αϙʔτ • ϥϯμϜͳೖྗΛݩʹੑ࣭Λݕূ • Example-based Λஔ͖͑ΔͷͰͳ͍ ͱ͖ͬͭͮΒ͍ߟ͑ํ͕ͩ ͓֮͑ͯ͘ͱڧྗͳΧʔυ ࠷ॳ
એ Copyright (C) DeNA Co.,Ltd. All Rights Reserved.
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͲͳͨͰొஃ0,ʂ
Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͲͳͨͰొஃ0,ʂ DeNA ʹͯ
9/9ʢ݄ʣ 19:00 ʙ
Let’s try Property-based Testing Copyright (C) DeNA Co.,Ltd. All Rights
Reserved. XJUI,PUMJO5FTU