Cucumber on Scala

Quick introduction to Scala for Ruby developers. I showcased Cucumber running in a Play (Scala) application.

Presentation I gave for the Ruby user group in Vienna.

Transcript

1. on Sebastian Nozzi viernes 6 de septiembre
2. Background • Working with Java since 2001 • Flirting with Smalltalk all these years • Developing with Rails since September 2012 • Hooked with Scala since January 2013 • Developing with Play since June 2013 viernes 6 de septiembre
3. Scala Quick introduction to ... for developers viernes 6 de septiembre
4. Lightweight Syntax Object-Oriented Strong Static Typing Functional Scala Ruby Haskell viernes 6 de septiembre
5. Some Code viernes 6 de septiembre
6. class Greeter(var name: String = "World") { def sayHi { println(s"Hello $name!") } def sayBye { println(s"Bye $name, come back soon.") } } val g = new Greeter greeter.sayHi >> "Hello World!" greeter.name = "vienna.rb" greeter.sayHi >> "Hello vienna.rb!" greeter.name >> "vienna.rb" viernes 6 de septiembre
7. ScalaTour.com powered by scalaKata.com viernes 6 de septiembre
8. viernes 6 de septiembre
9. Similarities: Ruby / Scala • Object Oriented • Mixins / Traits • Blocks / First-class Functions • Powerful Collection APIs • method_missing / Dynamic trait • Console / REPL • More Elegant than predecessor (Perl / Java) viernes 6 de septiembre
10. Cultural Impact of Ruby / Rails • Developer happiness matters • Productivity matters • Elegance matters • Lambdas are a must • DSLs are cool viernes 6 de septiembre
11. viernes 6 de septiembre
12. • Borrows heavily from Rails • Convention over Configuration • Routes • REST / MVC • Models, Controllers, Fragments, Helpers, etc. • Save + Reload viernes 6 de septiembre
13. 3 Aspects I missed from Rails (from many many more ;-) viernes 6 de septiembre
14. ActiveRecord db:migrate Cucumber ActiveRecord (for Scala) Flyway Cucumber-JVM today viernes 6 de septiembre
15. viernes 6 de septiembre
16. Feature: Posting status updates The goal of the system is keep co-workers informed by posting status updates. Background: Given that user "manager" exists And that user "manager" posted | first day at work | | meeting people | | working like crazy | Scenario: Posts are ordered chronologically (newest on top) When I go to the posts page of user "manager" Then the post nr. 1 should contain "working" And the post nr. 2 should contain "meeting" And the post nr. 3 should contain "first" Feature name Description These steps get executed before each Scenario Steps in a Scenario Scenario name viernes 6 de septiembre
17. And("""^press "([^"]*)"$""") { (buttonLabel: String) => ... ... } triple-quotes triple-quotes allows using unescaped quotes viernes 6 de septiembre
18. And("""^press "([^"]*)"$""") { (buttonLabel: String) => ... ... } block viernes 6 de septiembre
19. And("""^press "([^"]*)"$""") { (buttonLabel: String) => ... ... } capturing group corresponding parameter viernes 6 de septiembre
20. Then("""^the user should have (\d+) posts$""") { (amountPosts: Int) => ... ... ... } capturing group corresponding parameter notice the type viernes 6 de septiembre
21. Cucumber Demo viernes 6 de septiembre
22. viernes 6 de septiembre
23. Conclusion • Ruby / Rails influcence is everywhere • Possible for me to have some the Ruby coolness • Other languages (ahem, Scala) have cool ideas/concepts too ;-) • Ruby / Rails source of innovation and inspiration Keep innovating and making the world cool! viernes 6 de septiembre