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
ゼロからはじめる採用広報
yutadayo
3
910
赤煉瓦倉庫勉強会「Databricksを選んだ理由と、絶賛真っ只中のデータ基盤移行体験記」
ivry_presentationmaterials
2
360
改めてAWS WAFを振り返る~業務で使うためのポイント~
masakiokuda
2
250
NewSQLや分散データベースを支えるRaftの仕組み - 仕組みを理解して知る得意不得意
hacomono
PRO
2
130
OSSのSNSツール「Misskey」をさわってみよう(右下ワイプで私のOSCの20年を振り返ります) / 20250705-osc2025-do
akkiesoft
0
160
React開発にStorybookとCopilotを導入して、爆速でUIを編集・確認する方法
yu_kod
1
270
United Airlines Customer Service– Call 1-833-341-3142 Now!
airhelp
0
170
Delta airlines Customer®️ USA Contact Numbers: Complete 2025 Support Guide
deltahelp
0
680
MobileActOsaka_250704.pdf
akaitadaaki
0
120
第4回Snowflake 金融ユーザー会 Snowflake summit recap
tamaoki
1
280
Should Our Project Join the CNCF? (Japanese Recap)
whywaita
PRO
0
340
ネットワーク保護はどう変わるのか?re:Inforce 2025最新アップデート解説
tokushun
0
200
Featured
See All Featured
A designer walks into a library…
pauljervisheath
207
24k
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.7k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
970
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
54k
Git: the NoSQL Database
bkeepers
PRO
430
65k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
950
A better future with KSS
kneath
238
17k
Building Adaptive Systems
keathley
43
2.7k
Typedesign – Prime Four
hannesfritz
42
2.7k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Designing for humans not robots
tammielis
253
25k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
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!