snapshot testing (laraconus)

Transcript

1. A practical intro to
   snapshot testing
   

   View Slide

2. Pronouncing Dutch
   Michael

   3/10
   Jacob

   1/10
   

   View Slide

3. Pronouncing Dutch
   Michael

   9/10
   Jacob

   9/10
   

   View Slide

4. Drake
   

   View Slide

5. Frake
   

   View Slide

6. Pronouncing Dutch: Spatie
   Spa Sea
   

   View Slide

7. LET’S TALK SNAPSHOT TESTING
   

   View Slide

8. A file on disk, let’s call in snapshot
   Test succeeds if output matches snapshot
   If not, test will fail
   What?
   

   View Slide

9. Old name: characterization testing
   Popularized by Facebook
   Jest
   Testing interfaces
   Where does it come from?
   

   View Slide

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

    View Slide

11. DEMO
    

    View Slide

12. WRAPPING UP
    

    View Slide

13. Advantages
    Very easy to get started with
    Can be used to validate complex output
    Easily update all the tests in one go
    

    View Slide

14. Disadvantages
    Brittle
    Hard to pinpoint exact point of failure
    Bugs can be easily written in the snapshots
    

    View Slide

15. 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
    

    View Slide

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

    View Slide

17. QUESTIONS?
    

    View Slide