Lessons Learned from a Year of TDD and BDD

Transcript

1. Lessons Learned from a year of TDD and BDD Ryan Castillo - @rmcastil Friday, September 14, 12
2. Life Before Testing Friday, September 14, 12
3. Friday, September 14, 12
4. Started with Ruby/Rails • has a culture of testing Friday, September 14, 12
5. • Test Driven Development (TDD) - writing tests before writing the code being tested • Behavior Driven Development (BDD) - an evolution of TDD where the focus is on what an object does rather than what it is Jargon Friday, September 14, 12
6. All my Problems are Gone! Friday, September 14, 12
7. Lesson 1: You can use tests to drive your development Friday, September 14, 12
8. The Steps 1. Red 2. Green 3. Refactor 4. Repeat steps 1-3 Friday, September 14, 12
9. Live Coding! Friday, September 14, 12
10. Lesson 2: If you follow the steps correctly it will lead to ‘emergence’ in your code Friday, September 14, 12
11. An Important Trick • Decrease the time between green • Set a constraint on how much time you should have between green tests • If you don’t meet the time constraint throw that code out (git checkout .) Friday, September 14, 12
12. Lesson 3: the tests can heavily influence the design and vice versa Friday, September 14, 12
13. Embrace the Pain Friday, September 14, 12
14. Lesson 4: Pains with testing may reveal problems with your code Friday, September 14, 12
15. Binary Test Suite Friday, September 14, 12
16. Lesson 5: A binary test suite may be violating the DRY principal or you have heavy coupling somewhere Friday, September 14, 12
17. Slow Tests Friday, September 14, 12
18. Lesson 6: By default Rails tests are slow because they load Rails Friday, September 14, 12
19. For Testing Controllers in Isolation Friday, September 14, 12
20. For Testing Models in Isolation Friday, September 14, 12
21. Lesson 7: Faster tests really mean better design Friday, September 14, 12
22. This allows you to think outside of Rails (or whatever framework) and back into Ruby Friday, September 14, 12
23. Alcohol Connoisseur Friday, September 14, 12
24. Lesson 8: Knowing when and how to test Friday, September 14, 12
25. Lesson 9: But any tests are better than no tests Friday, September 14, 12
26. Lesson 10: You’ve Leveled up at Refactoring Friday, September 14, 12
27. Links and Resources • Michael Feathers on synergy between testing and design http://vimeo.com/15007792 • Corey Haines Fast Rails Tests http:// vimeo.com/30893836 • Corey Haines AR helper https:// gist.github.com/2068977 • Destroy All Software https:// www.destroyallsoftware.com Friday, September 14, 12
28. Questions? Friday, September 14, 12