How to reduce spec runtime by 4400%

How to monkey patch Capybara to avoid session reset

Transcript

1. Reducing RSpec Runtime by 4400% by @jimmynguyc
2. • Engineering Team Lead @ RapidRiver (rrsoft.co) • Specialized in Rails • Remote First Teams • We’re Hiring!! :D
3. Outline • What is RSpec • What are Feature Specs • What are scriptable, headless browsers • Why is it so f**king slow • How I fixed it
4. RSpec
6. Feature Specs • Feature specs are high-level tests meant to exercise slices of functionality through an application. They should drive the application only via its external interface, usually web pages.
8. • Pages are rendered • Javascript executed • CSS are applied • Images are loaded
9. Headless & Scriptable Browser Engines
10. Browser Engines KHTML
11. Popular RSpec HSBE • capybara-webkit • poltergeist with PhantomJS
12. Why Poltergeist? • Both based on WebKit • Better UI simulation (e.g. overlapping element prevent clicks) • Can raise JS errors as test errors (js_errors: true) • Easier to install (standalone executable vs qt5 dependencies)
13. Setup https://github.com/teampoltergeist/poltergeist
14. https://github.com/teampoltergeist/poltergeist
15. But …
17. https://github.com/teampoltergeist/poltergeist#memory-leak
19. https://discuss.circleci.com/t/timeout-more-than-120-minutes/640
20. Why Slow AF? https://circleci.com/docs/1.0/test-metadata/
22. https://github.com/benzittlau/junit-xml-parser DEMO
24. DEBUGGING
25. https://github.com/LRDesign/rspec-steps
27. https://github.com/teamcapybara/capybara/pull/419
28. So Let’s DIY
29. spec/support/capybara.rb
30. spec/rails_helper.rb
31. spec/my_spec.rb spec/rails_helper.rb
32. • change before(:each) to before(:all) • turn let() variables to instance variables
33. THANKS