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
UnitTest Anti-Pattern
Search
Shoma Suzuki
January 30, 2018
Technology
2
1.9k
UnitTest Anti-Pattern
こんなUnitTest はイヤだ
~ 対策を添えて ~
Shoma Suzuki
January 30, 2018
Tweet
Share
More Decks by Shoma Suzuki
See All by Shoma Suzuki
Feedback Loops in Development
shomas
1
550
品質への取り組み
shomas
2
5.8k
メルカリにおける Software Engineer in Test
shomas
5
8.9k
Other Decks in Technology
See All in Technology
Oracle Cloud Infrastructure:2025年7月度サービス・アップデート
oracle4engineer
PRO
1
120
反脆弱性(アンチフラジャイル)とデータ基盤構築
cuebic9bic
3
170
ビジネス文書に特化した基盤モデル開発 / SaaSxML_Session_2
sansan_randd
0
260
Strands Agents & Bedrock AgentCoreを1分でおさらい
minorun365
PRO
6
240
【新卒研修資料】数理最適化 / Mathematical Optimization
brainpadpr
25
12k
Mambaで物体検出 完全に理解した
shirarei24
2
220
LLM 機能を支える Langfuse / ClickHouse のサーバレス化
yuu26
5
540
AWS re:Inforce 2025 re:Cap Update Pickup & AWS Control Tower の運用における考慮ポイント
htan
1
210
MCP認可の現在地と自律型エージェント対応に向けた課題 / MCP Authorization Today and Challenges to Support Autonomous Agents
yokawasa
5
1.9k
20250807_Kiroと私の反省会
riz3f7
0
180
バクラクによるコーポレート業務の自動運転 #BetAIDay
layerx
PRO
1
860
LLMで構造化出力の成功率をグンと上げる方法
keisuketakiguchi
0
510
Featured
See All Featured
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
139
34k
How to train your dragon (web standard)
notwaldorf
96
6.2k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
182
54k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
GitHub's CSS Performance
jonrohan
1031
460k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
Designing for humans not robots
tammielis
253
25k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
251
21k
Unsuck your backbone
ammeep
671
58k
Transcript
UnitTest Anti-Pattern 2018/01/30 BPStudy#125 Shoma Suzuki
About Me • Software Engineer in Test at Mercari •
github/twitter -> shoma • ։ൃ/ςετڥΛඋͨ͠Γ • CI ઃఆͨ͠Γ • ςετॻ͍ͨΓ • build Λͨ͠Γ • ٕज़తෛ࠴ͱ͖߹ͬͨΓ
For Disclaimer • xUnit Test Patterns xunitpatterns.com • Unit testing
Anti-patterns catalogue • stackoverflow.com/questions/333682/unit-testing-anti- patterns-catalogue • [༁] joker1007.hatenablog.com/entry/20130709/ 1373365053 • TddAntiPatterns www.hyuki.com/yukiwiki/wiki.cgi?TddAntiPatterns (ݪจ 404 NotFound) ʹ͍͍ͩͨॻ͍ͯ͋Γ·͢
͜ΜͳUnitTest ΠϠͩ ~ ରࡦΛఴ͑ͯ ~
1. Assertion ͕ແ͍ @Test public testSomething() { arrangeCondition(); sut.theMethod(); }
1. Assertion ͕ແ͍ • [ݪҼ] ྫ֎͕ग़ͳ͚Ε͍͍/ಈ͔͚ͩ͢Ͱςετͨͭ͠ Γ • [ରࡦ] PMD
JUnitTestsShouldIncludeAssert pmd.sourceforge.net/pmd-4.3.0/rules/ junit.html#JUnitTestsShouldIncludeAssert • [ରࡦ] phpunit —report-useless-tests phpunit.de/manual/current/en/risky-tests.html • [ରࡦ] Test ͷଥੑΛݕূ͢Δ Mutation Test
2. ։ൃऀͷखݩ͚ͩͰಈ͘ def test_config_exists(): assert os.path.isfile(‘/Users/shoma/.gitconfig’)
2. ։ൃऀͷखݩ͚ͩͰಈ͘ • ιʔείʔυཧ֎ͷϑΝΠϧҙ • /usr/bin ͱ͔ո͍͠ • ڥηοτΞοϓͷқ্͕͕Δ •
127.0.0.1/localhost ҙ͕ඞཁ • [ରࡦ] ڥʹԠͯ͡มΘΔͷڥมΛ͏ • [ରࡦ] ηοτΞοϓؚΊ࣮ͨߦํ๏ͷ౷ҰԽ • [ରࡦ] ૣΊͷ CI • [ରࡦ] ։ൃ/ຊ൪Ұக 12factor.net/ja/dev-prod-parity
3. ςετ͍ͯ͠ΔͷMockͩ class TheService { public Long calculate(Long a, Long
b) { return innerService.calculate(a, b); } } @Test void testCalulate() { InnerService service = mock(InnerService.class): when(service.calculate(19L, 21L)).thenReturn(42L); // ུ Long res = theService.calculate(19L, 21L); assertEquals(LongValueOf(42L), res); }
3. ςετ͍ͯ͠ΔͷMockͩ • [ݪҼ] Mock Λ͍͗ͯ͢͠·͏ • [ରࡦ] CodeCoverageϨϙʔτΛΈΑ͏ •
[ରࡦ] Mutation Test (લड़)
4. ඪ४ػೳͷςετ • Bug͕͋ΔͳΒ͓͍ͬͯͯΑ͍ • ਖ਼نදݱͩͱΓ͕ͪ • ʮTDD ։ൃதͷෆ҆Λίϯτʔϧ͢Δํ๏ͩʯ •
ڍಈͷཧղਂ·Δ • [ݪҼ] ϥΠϒϥϦʹςετ͕ແ͔ͬͨ ˠ OSS ߩݙνϟϯε • [ରࡦ] ͋ͳͨͷίʔυΛςετ͠Α͏
5. ಈ͔͢ͱ՝ۚ͞ΕΔ • [ݪҼ] ΫϥυαʔϏεΛ͍ͬͯΔ • [ݪҼ] Credential ͷѻ͍͕͍͋͠… •
[ରࡦ] SDK ʹ Stub/Fake/Simulator ͕͋Δ͔ ֬ೝ͠Α͏ • [ରࡦ] ͜͜ Mock Խ
6. ͱ͖Ͳ͖ࣦഊ͢Δ • ΜͰ·͢ • [ରࡦ] Vefiry-Act-Vefiry • arrange લͷࣄલ͕݅Ήঢ়ଶͰ͋Δ͔֬ೝ͢Δ
testautomationpatterns.wikispaces.com/VERIFY-ACT-VERIFY • [ରࡦ] ෆ҆ఆͳςετΛmark ͓ͯ͘͠ github.com/nodejs/node/wiki/Flaky-tests • [ରࡦ] TestSize Λنఆͯ͠UnitTest ͱͯ͠ΔൣғΛܾΊΔ testing.googleblog.com/2010/12/test-sizes.html
Happy Unit Testing!