snapshot testing (phplimburg)

Transcript

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   A practical intro to snapshot testing and PHPUnit-watcher

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   About me Freek Van der Herten Partner & developer at

   SPATIE Blogging at https://murze.be https://murze.be/newsletter
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   OPEN SOURCE SOFTWARE

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   https://spatie.be/en/opensource/laravel

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   Open source software ± 160 public repositories on GitHub August

   2016: ± 800 000 downloads August 2017: ± 5 000 000 downloads ± 500 000 downloads a month
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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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   Another 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
 
 https://github.com/spatie/phpunit-watcher Interesting links

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

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    QUESTIONS?