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Snapshot testing (dpc)
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Freek Van der Herten
June 30, 2017
Technology
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Snapshot testing (dpc)
Freek Van der Herten
June 30, 2017
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Transcript
A practical intro to snapshot testing
About me Freek Van der Herten Partner & developer at
SPATIE @freekmurze https://murze.be
About me phpantwerp.be Dries Vints @driesvints Frederick Vanbrabant @TheEdonian
Since 2003 Websites, applications and webshops Team 4 developers, 1
manager Specialization Laravel development
OPEN SOURCE SOFTWARE
± 120 packages on Packagist Laravel, Framework agnostic PHP ±
4 000 000 downloads in total, growing ±450 000 a month We create a lot of it Open source software
http://github-awards.com/users?type=world&language=php Open source software
LET’S TALK SNAPSHOT TESTING
A file on disk, let’s call in snapshot Test succeeds
if output matches snapshot If not, test will fail What?
Old name: characterization testing Popularized by Facebook Jest Testing interfaces
Where does it come from?
https://github.com/spatie/phpunit-snapshot-assertions assertMatchesSnapshot assertMatchesJsonSnapshot assertMatchesXmlSnapshot How can we do it in
PHP?
DEMO
WRAPPING UP
Advantages Very easy to get started with Can be used
to validate complex output Easily update all the tests in one go
Disadvantages Brittle Hard to pinpoint exact point of failure Bugs
can be easily written in the snapshots
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
QUESTIONS?
Thank you! https://speakerdeck.com/freekmurze/snapshot-testing-dpc https://spatie.be/opensource https://murze.be https://murze.be/newsletter/