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
910
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
5.7k
XCTest(再)入門/reintroduction-to-xctest
yusukehosonuma
0
490
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
6.3k
Other Decks in Programming
See All in Programming
Rubyでやりたい駆動開発 / Ruby driven development
chobishiba
1
730
Porting a visionOS App to Android XR
akkeylab
0
480
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
91
30k
なぜ適用するか、移行して理解するClean Architecture 〜構造を超えて設計を継承する〜 / Why Apply, Migrate and Understand Clean Architecture - Inherit Design Beyond Structure
seike460
PRO
3
780
Team operations that are not burdened by SRE
kazatohiei
1
310
プロダクト志向ってなんなんだろうね
righttouch
PRO
0
190
Node-RED を(HTTP で)つなげる MCP サーバーを作ってみた
highu
0
120
Rails Frontend Evolution: It Was a Setup All Along
skryukov
0
160
「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder
munetoshi
0
180
設計やレビューに悩んでいるPHPerに贈る、クリーンなオブジェクト設計の指針たち
panda_program
6
2.2k
GitHub Copilot and GitHub Codespaces Hands-on
ymd65536
2
150
初学者でも今すぐできる、Claude Codeの生産性を10倍上げるTips
s4yuba
16
11k
Featured
See All Featured
Large-scale JavaScript Application Architecture
addyosmani
512
110k
A Modern Web Designer's Workflow
chriscoyier
695
190k
Become a Pro
speakerdeck
PRO
29
5.4k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.5k
Unsuck your backbone
ammeep
671
58k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
510
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.8k
Done Done
chrislema
184
16k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
740
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
46
9.6k
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