What your tests are telling you

This is a talk I gave for a ruby meetup in Santiago de Chile, http://www.meetup.com/dynlangchile/events/114324612/ talking a little about the thinks in Test Driven Development appart from Test First.

Special credits to Zach Holman, for http://zachholman.com/posts/slide-design-for-developers/

My first slides are way too similar to Holman's but I gonna create my own style for my talks incrementally

Transcript

1. what your TESTS by Felipe Espinoza are telling YOU I’m using this as a base palette http://www.colourlovers.com/palette/2815221/Space_Travel
2. @fespinozacast This is me with a cool hat
3. Testing is GOOD
4. Guard against regressions Gain confidence to change Guides towards better code design Live documentation
5. but in EVERYDAY practice...
6. Testing is GOOD In reality is “Why we usually don’t test our apps?”
7. Testing is GOOD IN THEORY In reality is “Why we usually don’t test our apps?”
8. Slow test suites ~/my_awesome_project % rspec spec .................................................. .................................................. .............................. rspec spec 22.68s user 2.05s system 6% cpu 6:03.46 total PROBLEM PROBLEM: Slow test suites are meant to not to be run
9. Tests Maintainability What if I change my form id to #new_awesome_form? PROBLEM PROBLEM: Little changes causes lots of errors
10. Tests Maintainability ~/my_awesome_project % rspec spec ..........FFFF...........FFF..................FFFF ....FFF.........FFF.........FF.............FF..... ...F.....FF...FFF.....FFF...... What if I change my form id to #new_awesome_form? PROBLEM PROBLEM: Little changes causes lots of errors
11. ~/my_awesome_project % rspec spec ....F............. PROBLEM PROBLEM: Test are not trustworthy because they fail randomly
12. ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ....F....F..F..... PROBLEM PROBLEM: Test are not trustworthy because they fail randomly
13. ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... PROBLEM PROBLEM: Test are not trustworthy because they fail randomly
14. ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... Pray-Driven Development PROBLEM PROBLEM: Test are not trustworthy because they fail randomly
15. Other Testing Smells PROBLEM Class difficult to test Wish to access private variable Difficult Test Setup Dependent of external services Difficult Mocking State Leaks across tests PROBLEM: a list of other testing smells
16. Testing is GOOD IN THEORY We can tackle this problems by listening to our tests
17. Testing is GOOD We can tackle this problems by listening to our tests
18. Testing is GOOD IN REALITY We can tackle this problems by listening to our tests
19. sloooooooooooooo ooooooooooooooo oooooooooooooow test suite
20. A simple Rails Test Case...
21. A simple Rails Test Case...
22. A simple Rails Test Case... ~/Talks/testing/shopping_cart_example ☺ time rspec spec .. Finished in 0.07256 seconds 2 examples, 0 failures rspec spec 2.73s user 0.30s system 99% cpu 3.035 total
23. A simple Rails Test Case... ~/Talks/testing/shopping_cart_example ☺ time rspec spec .. Finished in 0.07256 seconds 2 examples, 0 failures rspec spec 2.73s user 0.30s system 99% cpu 3.035 total
24. A simple Rails Test Case... ~/Talks/testing/shopping_cart_example ☺ time rspec spec .. Finished in 0.07256 seconds 2 examples, 0 failures rspec spec 2.73s user 0.30s system 99% cpu 3.035 total
25. It is rails boot time!
26. It is rails boot time! We can add Spork, Zeus, etc, to speed up the rails boot time Test First
27. It is rails boot time! Or we can extract our logic outside rails! Test Driven Development We can add Spork, Zeus, etc, to speed up the rails boot time Test First VS
28. Testing outside rails...
29. Testing outside rails...
30. Testing outside rails...
31. Testing outside rails... ~/Talks/testing/shopping_cart_example ☺ time rspec spec/lib .. Finished in 0.00137 seconds 2 examples, 0 failures rspec spec/lib 0.56s user 0.08s system 98% cpu 0.643 total
32. Testing outside rails... ~/Talks/testing/shopping_cart_example ☺ time rspec spec/lib .. Finished in 0.00137 seconds 2 examples, 0 failures rspec spec/lib 0.56s user 0.08s system 98% cpu 0.643 total
33. Brittle Tests
34. Let’s see an Acceptance Test...
35. Let’s see an Acceptance Test... What it I change the form id to #new_awesome_product?
36. Extracting Behavior as Macro... We are localizing some behavior in files, and creating a custom DSL for testing our application
37. Extracting Behavior as Macro... We are localizing some behavior in files, and creating a custom DSL for testing our application
38. What about PDD... ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... 1 1. Pray Driven Development
39. What about PDD... ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... Timebox 1 1. Pray Driven Development
40. What about PDD... ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... Timebox Rethink 1 1. Pray Driven Development
41. What about PDD... ~/my_awesome_project % rspec spec ....F............. ~/my_awesome_project % rspec spec ......F..F........ ~/my_awesome_project % rspec spec ....F....F..F..... Timebox Rethink Delete 1 1. Pray Driven Development
42. On the shoulder of GIANTS
43. Corey Haines, Fast Rails Tests http://vimeo.com/30893836 @coreyhaines
44. Corey Haines, Fast Rails Tests http://vimeo.com/30893836 @coreyhaines
45. Robbie Clutton & Matt Parker, It’s not your test framework, it’s you goo.gl/MCftE http://vimeo.com/15007792 Michael Feathers, The Deep Synergy between Testability and Good Design @mfeathers
46. @bkeepers https://speakerdeck.com/bkeepers/why-our-code-smells Brandon Keepers, Why Our Code Smells Gary Bernhardt, Sucks/Rocks Series https://www.destroyallsoftware.com/ @garybernhardt
47. Extra Tip, Dash App http://kapeli.com/
48. Thanks!
49. Felipe Espinoza fespinoza.gihtub.io fespinozacast fespinoza https://speakerdeck.com/fespinoza/ what-your-tests-are-telling-you