snapshot testing (phplimburg)

Transcript

1. A practical intro to snapshot testing and PHPUnit-watcher

2. About me Freek Van der Herten Partner & developer at

   SPATIE Blogging at https://murze.be https://murze.be/newsletter

3. OPEN SOURCE SOFTWARE

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

5. Open source software ± 160 public repositories on GitHub August

   2016: ± 800 000 downloads August 2017: ± 5 000 000 downloads ± 500 000 downloads a month

6. LET’S TALK SNAPSHOT TESTING

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

   if output matches snapshot If not, test will fail What?

8. Another name: characterization testing Popularized by Facebook Jest Testing interfaces

   Where does it come from?

9. https://github.com/spatie/phpunit-snapshot-assertions assertMatchesSnapshot assertMatchesJsonSnapshot assertMatchesXmlSnapshot How can we do it in

   PHP?

10. DEMO

11. WRAPPING UP

12. Advantages Very easy to get started with Can be used

    to validate complex output Easily update all the tests in one go

13. Disadvantages Brittle Hard to pinpoint exact point of failure Bugs

    can be easily written in the snapshots

14. 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

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

16. QUESTIONS?