Chromaticで手軽にVisual Regression Testを導入する / Visual Regression Testing with Chromatic

by Shingo Yamazaki

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ChromaticͰ खܰʹ Visual Regression TestΛ ಋೖ͢Δ 2019/06/28 We Are JavaScripters! @33rd

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࠷ۙௐ΂͍ͯͨ πʔϧͷ࿩Λ͠·͢

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• Shingo Yamazaki • αΠϘ΢ζגࣜձࣾ (2018/12~) • kintone ։ൃνʔϜɹ݉  ϑϩϯτΤϯυΤΩεύʔτνʔϜ • #WeJS ॳࢀՃͰ͢ About me zaki-yama zaki___yama

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• ͱ͋ΔUIίϯϙʔωϯτϥΠϒϥϦ։ൃͷ  ͓ख఻͍Λ͍ͯ͠Δ • JS -> TypeScript Ҡߦ͕ϝΠϯ • ʮUI ίϯϙʔωϯτ͕σάϨͯ͠ͳ͍͜ͱΛ୲อ͢Δ ͘͠Έʗπʔϧ͕΄͍͠Ͷʯͱ͍͏࿩͕͋ͬͨ • ݱࡏ͸ Storybook + Storyshots Λར༻த Intro

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• UIίϯϙʔωϯτͷ։ൃ & ϒϥ΢δϯά؀ڥΛఏڙ ͢ΔOSS • ίϯϙʔωϯτΛΞϓϦ έʔγϣϯͱಠཱͨ͠؀ڥ Ͱ։ൃͰ͖Δ • ಈ࡞͢Δίϯϙʔωϯτ͕ ҰཡͰݟΒΕΔ Storybook?

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• StorybookͷΞυΦϯ • JestͷSnapshot TestingΛར༻ • ίϯϙʔωϯτͷSnapshotΛऔ ಘ͠ɺอଘͯ͋͠Δ΋ͷͱൺֱ • DOMͷൺֱͳͷͰɺελΠϧͷ ่Εͱ͔͸ݕ஌Ͱ͖ͣ Storyshots? IUUQTTUPSZCPPLKTPSHEPDTUFTUJOHTUSVDUVSBMUFTUJOH

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https://twitter.com/domyen/status/1138861429669412864?s=20

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https://twitter.com/domyen/status/1138861429669412864?s=20 %FTJHOTZTUFN͸͓͖ͯ͞ ͜ͷπʔϧؾʹͳΔ

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Chromatic

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Chromatic

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• Visual Testing Λ΍ͬͯ͘ΕΔαʔϏε • “Made for Storybook by Storybook maintainers” • OSS͸ແྉ Chromatic

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DEMO

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࢖͍ํ

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• Storybook ಋೖࡁΈͷGitHubϦϙδτϦΛ༻ҙ • https://www.chromaticqa.com/ ʹΞΫηε • GitHubΞΧ΢ϯτͰSign in • Add project ͰϦϙδτϦΛબ୒ ΞΧ΢ϯτొ࿥ #JUCVDLFU (JU-BC ʹ΋ରԠ

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ϦϙδτϦଆͰඞཁͳͷ͸3 Step $ISPNBUJDΛ Πϯετʔϧ TUPSZCPPLDPOpHKTʹ ߦ௥Ճ εΫϦϓτ࣮ߦ project͝ͱʹϢχʔΫͳapp code

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͜ͷ63-ʹΞΫηε

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• ͋ͱ͸chromatic testͷͨͼʹbuild & diffൺֱ ॳճͷbuild੒ޭ

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package.json CIͷઃఆ(CircleCIͷ৔߹) .circleci/conﬁg.yml

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• \ • CIͷઃఆ(CircleCIͷ৔߹) BQQDPEFͰ౉͍ͯͨ͠஋

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Ͱ͖ͨ

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EJ⒎Λ֬ೝ͠ɺ"DDFQU%FOZ શ෦νΣοΫ͢Δͱ(JU)VCଆͷεςʔλ ε΋ߋ৽͞ΕΔ %0.ʹมߋ͋Ε͹͜͜ʹදࣔ͞ΕΔ

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ศརͳػೳ

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ίϯϙʔωϯτΛදࣔ͠ͳ͕ΒɺҟͳΔϒϥϯ ν΍աڈͷϏϧυ݁Ռʹ੾Γସ͑ΒΕΔ Library

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※Standard/Pro ϓϥϯͷΈ Multi Browser Support

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ࢦఆͨ͠ViewportͰෳ਺ͷSnapshotΛࡱͬͯ͘ ΕΔ Viewports

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Tips

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• ࠩ෼͕͋ͬͯ΋Ϗϧυࣗମ͸Passʹ͢Δ • ͚ͭͳ͍ͱʮશ෦Accept͚ͨ͠ͲCircleCIͷ εςʔλε͸FailedͰϚʔδͰ͖ͳ͍ʯͱͳΔ CI༻ͷεΫϦϓτʹ͸ --exit-zero-on-changesΛ͚ͭΔ

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Open source plan͸৹͕ࠪඞཁ 4JHOJOͨ͠Βී௨ʹ࢖͑ͨͷͰ 1VCMJD3FQPTJUPSZͳΒͳΜͰ΋0,ͳͷ͔ͱࢥͬͯ·ͨ͠

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• ҰԠChatͰฉ͍͚ͨͲ  ΍ͬͺΓͦ͏ͬΆ͍ Open source plan͸৹͕ࠪඞཁ

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• ໌ه͞Εͯͳ͍͕  ͜Ε΋ChatͰฉ͍ͯΈͨ • গͳ͘ͱ΋Browser͸  ChromeͷΈͱͷ͜ͱ Open source plan͸ starter planѻ͍ʁ

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೔ຊޠϑΥϯτ͕… ͜Ε͕ ͜͏ͳͬͨ

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• .storybook/preview-head.htmlͰ  web fontಡΈࠐ·ͤͯΈ͚ͨͲͩΊͰͨ͠ ೔ຊޠϑΥϯτ͕…

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• ։ൃνʔϜʹ  ϑΟʔυόοΫ͢Δɺ  ͱ͸ݴͬͯͨ ೔ຊޠϑΥϯτ͕…

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• StorybookΛར༻͍ͯ͠ΔϓϩδΣΫτʹ͸  ͔ͳΓ͓खܰʹಋೖͰ͖Δ • diff͸एׯݟͮΒ͍ʢओ؍ʣ͚Ͳػೳ͸े෼ • ଞπʔϧͱൺֱͨ͠Θ͚Ͱ͸ͳ͍Ͱ͕͢ • OSSͳΒແྉʢͨͩ͠৹ࠪ͋Γʣ ·ͱΊ