Snapshot testing (nomadphp)

Transcript

1. 1.

   A practical intro to snapshot testing

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   About me Freek Van der Herten Partner & developer at

   SPATIE @freekmurze https://murze.be
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   About me phpantwerp.be Dries Vints @driesvints Frederick Vanbrabant @TheEdonian

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   Since 2003 Websites, applications and webshops Team 4 developers, 1

   manager Specialization Laravel development
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   OPEN SOURCE SOFTWARE

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   ± 120 packages on Packagist Laravel, Framework agnostic PHP ±

   4 000 000 downloads in total, growing ±500 000 a month We create a lot of it Open source software
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   http://github-awards.com/users?type=world&language=php Open source software

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   LET’S TALK SNAPSHOT TESTING

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   A file on disk, let’s call in snapshot Test succeeds

   if output matches snapshot If not, test will fail What?
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    Old name: characterization testing Popularized by Facebook Jest Testing interfaces

    Where does it come from?
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    https://github.com/spatie/phpunit-snapshot-assertions assertMatchesSnapshot assertMatchesJsonSnapshot assertMatchesXmlSnapshot How can we do it in

    PHP?
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    DEMO

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    WRAPPING UP

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    Advantages Very easy to get started with Can be used

    to validate complex output Easily update all the tests in one go
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    Disadvantages Brittle Hard to pinpoint exact point of failure Bugs

    can be easily written in the snapshots
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    https://github.com/spatie/phpunit-snapshot-assertions https://sebastiandedeyne.com/posts/2017/a-package-for-snapshot- testing-in-phpunit https://murze.be/2017/04/practical-introduction-snapshot-testing/ https://www.sitepoint.com/snapshot-testing-viable-php/ https://facebook.github.io/jest/docs/snapshot-testing.html Interesting links

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    Thank you! https://speakerdeck.com/freekmurze/snapshot-testing-nomadphp https://spatie.be/opensource https://murze.be https://murze.be/newsletter/

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    QUESTIONS?