![Write another failing test:def test_add_1_plus_2assert_equal 3, add(1,2)EndLoaded suite TddExampleStartedFFinished in 0.042739 seconds.1) Failure:test_add_1_plus_1(TddExample) [tdd.rb:42]:<3> expected but was<2>.1 tests, 1 assertions, 1 failures, 0 errors](https://image.slidesharecdn.com/tdd-100628042000-phpapp02/85/Test-Driven-Development-Why-I-hate-it-but-secretly-love-it-18-320.jpg)
Test Driven Development: Why I hate it; but secretly love it.
- 1. Test Driven Development Why I hate it, but really love it.
- 4. Make it Pretty (refactor)(Not Like this chap)
- 6. WHY TDD?
- 7. Stability
- 8. Flexibility
- 10. MORE SPEEEEDzzz
- 11. Design
- 12. HOW TDD?(Disclaimer: Code incoming!)
- 13. Writing an adding, er.. Thing…Failing Test:def test_add_1_plus_1assert_equal 2, add(1,1)endOutput:tdd.rb:6:in `test_add_1_plus_1': undefined method `add' for main:Object (NoMethodError)from tdd.rb:9
- 14. WHATS THE NEXT STEP?
- 15. Make it pass:def add(i,j) return 2endOutput:Loaded suite TddExampleStarted.Finished in 0.000455 seconds. 1 tests, 1 assertions, 0 failures, 0 errors
- 16. Waait!! Why isn’t it just:def add(i,j) return i+jend
- 17. WHATS THE NEXT STEP?
- 18. Write another failing test:def test_add_1_plus_2assert_equal 3, add(1,2)EndLoaded suite TddExampleStartedFFinished in 0.042739 seconds.1) Failure:test_add_1_plus_1(TddExample) [tdd.rb:42]:<3> expected but was<2>.1 tests, 1 assertions, 1 failures, 0 errors
- 19. Make it pass:def add(i,j) return i+jEndLoaded suite TddExampleStarted..Finished in 0.000462 seconds.2 tests, 2 assertions, 0 failures, 0 errors
- 20. All about the baby steps
- 21. Problems?
- 23. How do we cope?
- 24. Any number of arguments?First add a test..def test_adding_three_argumentsassert_equal 4, add(1,2,1)EndMake it pass!!Add another test!!def test_adding_four_argumentsassert_equal 8, add(1,2,1,4)end
- 25. RefactorFor the general solution:def add(*args) return args.inject(0){|sum,n| sum + n}EndLoaded suite TddExampleStarted....Finished in 0.000941 seconds.4 tests, 4 assertions, 0 failures, 0 errors
- 26. Dependency Injection(This has nothing to do with children)
- 27. Example:class PersonDAO def initialize(user, password) @data_source = Database.connect(user, password) endendVSclass PersonDAO def initialize(data_source) @data_source = data_source endend
- 28. Why is this better?
- 29. And you’re telling me this… why?
- 30. Start off with a testdef setup @person = FamilGuyDao.newenddef test_return_full_name_is_reginald_von_griffenassert_equal "Reginald Von-Griffin", @person.full_nameend#But how do we make it vary? Pass in the name? Pull it from somewhere #Lets assume there is some Griffin Family Tree in the skydef test_return_full_name_is_stewie_griffinassert_equal "Stewie Griffin", @person.full_name end
- 31. For now we’ll pass in the name
- 32. Next Test….
- 33. Make it pass…
- 34. WHATS THE NEXT STEP?
- 35. The General CaseIntegration faked by Mock object!
- 36. MAKE IT PASS!!
- 37. DONE!