A brief introduction to testing and TDD

Transcript

1. A brief introduction to testing and TDD Madrid.rb Thursday, August 30, 12
2. Fernando Blat @ferblape Raúl Naveiras @rnaveiras Thursday, August 30, 12
3. (1) Testing, general ideas (2) Test Driven Development (3) Miscellaneous stuff Thursday, August 30, 12
4. (1) Testing, general ideas (2) Test Driven Development (3) Miscellaneous stuff Thursday, August 30, 12
5. Software testing is the process to verify that a piece of software has been developed according to the given specifications Thursday, August 30, 12
6. Code that executes our code against a set of expectations and assertions Tests Thursday, August 30, 12
7. Unit tests Tests individual parts of your code in a isolated way Thursday, August 30, 12
8. def  get_last_element(array)    array.last end Thursday, August 30, 12
9. def  get_last_element(array)    array.last end Thursday, August 30, 12
10. def  get_last_element(array)    array.last end Thursday, August 30, 12
11. def  get_last_element(array)    array.last end def  test_get_last_element Thursday, August 30, 12
12. def  get_last_element(array)    array.last end def  test_get_last_element    a  =  [1,2,3] Thursday, August 30, 12
13. def  get_last_element(array)    array.last end def  test_get_last_element    a  =  [1,2,3]    last  =  get_last_element(a) Thursday, August 30, 12
14. def  get_last_element(array)    array.last end def  test_get_last_element    a  =  [1,2,3]    last  =  get_last_element(a)    assert_equal  last,  3 Thursday, August 30, 12
15. def  get_last_element(array)    array.last end def  test_get_last_element    a  =  [1,2,3]    last  =  get_last_element(a)    assert_equal  last,  3 end Thursday, August 30, 12
16. And what about Rails? Easy unit testing for your models Thursday, August 30, 12
17. And what about Rails? Easy unit testing for your models Product,  Review,  Tag,  User Thursday, August 30, 12
18. Rails test folder test/ !"" fixtures/ !"" functional/ !"" integration/ !"" performance/ !"" test_helper.rb #"" unit/ Thursday, August 30, 12
19. Rails test folder test/ !"" fixtures/ !"" functional/ !"" integration/ !"" performance/ !"" test_helper.rb #"" unit/ !"" helpers/ !"" product_test.rb !"" review_test.rb !"" tag_test.rb #"" user_test.rb Thursday, August 30, 12
20. ProductTest require  'test_helper' class  ProductTest  <  ActiveSupport::TestCase    #  test  "the  truth"  do    #      assert  true    #  end end Thursday, August 30, 12
21. Run the tests Thursday, August 30, 12
22. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Thursday, August 30, 12
23. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   Thursday, August 30, 12
24. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: Thursday, August 30, 12
25. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: Finished  tests  in  0.001588s,  0.0000  tests/s,  0.0000   assertions/s. Thursday, August 30, 12
26. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: Finished  tests  in  0.001588s,  0.0000  tests/s,  0.0000   assertions/s. 0  tests,  0  assertions,  0  failures,  0  errors,  0  skips Thursday, August 30, 12
27. New feature! Thursday, August 30, 12
28. New feature! Add friendly SEO URLs to our application Thursday, August 30, 12
29. New feature! Add friendly SEO URLs to our application Product URL: Thursday, August 30, 12
30. New feature! Add friendly SEO URLs to our application Product URL: #  before Thursday, August 30, 12
31. New feature! Add friendly SEO URLs to our application Product URL: #  before example.com/products/1 Thursday, August 30, 12
32. New feature! Add friendly SEO URLs to our application Product URL: #  before example.com/products/1 #  after Thursday, August 30, 12
33. New feature! Add friendly SEO URLs to our application Product URL: #  before example.com/products/1 #  after example.com/products/renault-­‐megane Thursday, August 30, 12
34. Nicenamificating class Product < ActiveRecord::Base ... # Sanitize name into to be URL friendly # I.e “Renault Megane” -> “renault-megane” def nicename name.downcase.gsub(/[^a-z]/, "-") end end Thursday, August 30, 12
35. ProductTest require  'test_helper' class  ProductTest  <  ActiveSupport::TestCase    test  "#nicename  method"  do        product  =  Product.new        product.name  =  "Samsung  Galaxy"        assert_equal  "samsung-­‐galaxy",  product.nicename    end end Thursday, August 30, 12
36. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: . Finished  tests  in  0.091707s,  10.9043  tests/s,  10.9043   assertions/s. 1  tests,  1  assertions,  0  failures,  0  errors,  0  skips Thursday, August 30, 12
37. ProductTest require  'test_helper' class  ProductTest  <  ActiveSupport::TestCase    test  "#nicename  method"  do        product  =  Product.new        product.name  =  "Samsung  Galaxy"        assert_equal  "samsung-­‐galaxy",  product.nicename        product.name  =  "iPhone  5S"        assert_equal  "iphone-­‐5s",  product.nicename    end end Thursday, August 30, 12
38. ProductTest require  'test_helper' class  ProductTest  <  ActiveSupport::TestCase    test  "#nicename  method"  do        product  =  Product.new        product.name  =  "Samsung  Galaxy"        assert_equal  "samsung-­‐galaxy",  product.nicename        product.name  =  "iPhone  5S"        assert_equal  "iphone-­‐5s",  product.nicename    end end Thursday, August 30, 12
39. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: F Finished  tests  in  0.091707s,  10.9043  tests/s,  10.9043   assertions/s. 1)  Failure: test_#nicename(ProductTest)  [test/unit/product_test.rb:6]: <"iphone-­‐5s">  expected  but  was <"iphone-­‐-­‐">. 1  tests,  1  assertions,  1  failures,  0  errors,  0  skips Thursday, August 30, 12
40. Nicenamificating class Product < ActiveRecord::Base ... # Sanitize name into to be URL friendly # I.e “Renault Megane” -> “renault-megane” def nicename name.downcase.gsub(/[^a-z0-9]/, "-") end end Thursday, August 30, 12
41. Nicenamificating class Product < ActiveRecord::Base ... # Sanitize name into to be URL friendly # I.e “Renault Megane” -> “renault-megane” def nicename name.downcase.gsub(/[^a-z0-9]/, "-") end end Thursday, August 30, 12
42. Run the tests $  ruby  -­‐I  lib:test  test/unit/product_test.rb   Run  options:   #  Running  tests: . Finished  tests  in  0.082707s,  11.5041  tests/s,  10.5043   assertions/s. 1  tests,  2  assertions,  0  failures,  0  errors,  0  skips Thursday, August 30, 12
43. Acceptance Tests Thursday, August 30, 12
44. Acceptance Tests Is a set of one or more automate tests conducted to determine if the requirements of a specification or contract are met Thursday, August 30, 12
45. Acceptance Tests Provides more value because starts from the interface Thursday, August 30, 12
46. Acceptance Tests Helps to think like our feature should work Thursday, August 30, 12
47. Acceptance Tests Helps focus on the development of code that is really needed Thursday, August 30, 12
48. Acceptance Tests Less fragile is not coupled to the implementation Thursday, August 30, 12
49. Acceptance Tests require 'acceptance/acceptance_helper' feature 'Login', %q{ Given that I want to protect the products from not logged users When click in "New product" Then I should be redirected to login form } do scenario 'Should show login page when clicking new product link' do visit '/' click_link 'New Product' current_path.should == '/login' page.should have_content 'Log in' end end Thursday, August 30, 12
50. (1) Testing, general ideas (2) Test Driven Development (3) Miscellaneous stuff Thursday, August 30, 12
51. Test Driven Development Is a software development process that relies on the repetition of a very short development cycle Thursday, August 30, 12
52. Test Driven Development Thursday, August 30, 12
53. Test Driven Development Involves writing test before writing the code being tested Thursday, August 30, 12
54. Test Driven Development 1 - Write a small test, run it and check that it fails Red Thursday, August 30, 12
55. Test Driven Development 2 - Write the minimum piece of code to make that test pass. No more Green Thursday, August 30, 12
56. Test Driven Development 3 - Refactor: means changing the internal structure of an existing code without changing its behaviour Refactor Thursday, August 30, 12
57. Test Driven Development Repeat Red Green Refactor Thursday, August 30, 12
58. Benefits of TDD We know that our code is working! Thursday, August 30, 12
59. Benefits of TDD We know that our code will continue to work Thursday, August 30, 12
60. Benefits of TDD We know when we are done Thursday, August 30, 12
61. Benefits of TDD Our tests helped us design our code Thursday, August 30, 12
62. Benefits of TDD Our tests are documentation of our code does Thursday, August 30, 12
63. Benefits of TDD Able to release more often Thursday, August 30, 12
64. But I don’t have to do TDD It takes more time fix bugs Thursday, August 30, 12
65. But I don’t have to do TDD It takes more time to constantly manually test code to see if it’s all working Thursday, August 30, 12
66. But I don’t have to do TDD It takes more time to figure out what code is supposed to do Thursday, August 30, 12
67. But I don’t have to do TDD It takes time to figure out if my changes will break something Thursday, August 30, 12
68. Benefits of TDD Think long-term, not shot-term dude!! Thursday, August 30, 12
69. “If I don’t need to make it work, I can go a lot faster.” -- Kent Beck Thursday, August 30, 12
70. SHOW TIME!! -- Bebanjo Style Thursday, August 30, 12
71. (1) Testing, general ideas (2) Test Driven Development (3) Miscellaneous stuff Thursday, August 30, 12
72. http://jenkins-ci.org/ Thursday, August 30, 12
73. Thursday, August 30, 12
74. http://travis-ci.org/ Thursday, August 30, 12
75. LINKS http://guides.rubyonrails.org/testing.html http://everydayrails.com/2011/01/11/beginning-rails- testing.html http://www.codeschool.com/courses/rails-testing-for- zombies Thursday, August 30, 12
76. Any Questions? Thursday, August 30, 12
77. Thursday, August 30, 12
78. Thursday, August 30, 12
79. Thank you!! Thursday, August 30, 12