Test Driven Development

Apresentação sobre TDD na Universidade Tiradentes, 9a Semana de Informática. Maio/2012

Transcript

1. Test Driven Development Dante Regis
5. Test Driven Development A fatal exception 0E has ocurred at 0028:C0011E36 in VXD VMM(01) + 00010E36. The current application will be terminated. * Press any key to terminate the current application. * Press CTRL+ALT+DEL again to restart your computer. You will lose any unsaved information in all applications. Press any key to continue _
8. DÍVIDA TÉCNICA
10. medo
11. “a maior força do universo é a dos juros compostos” Albert Einstein True Story!
13. works! clean code that
14. muda seu código sempre!
17. Vídeo
19. Vídeo
20. TEST ALL TIME the fucking
21. unit tests
22. código código testando
23. feedback instantâneo
24. robusto código
25. confiança aumentam
26. test
27. test rst
29. produção teste falhando nenhum código de sem antes um teste
30. Vermelho Verde
32. redgreen refactor
33. design melhor
34. Demo
35. describe "Wrapper" do end
36. uma classe Wrapper devo chamar um método sem instanciar objeto o método leva como parametros a frase e o número de colunas
37. Wrapper.wrap("uma frase qualquer", 10)
38. describe "Wrapper" do it "wrap de string vazia" do Wrapper.wrap("", 10).should == "" end end
39. Running: spec/wrapper_spec.rb F Failures: 1) Wrapper wrap de string vazia Failure/Error: Wrapper.wrap("", 10).should == "" NameError: uninitialized constant RSpec::Core::ExampleGroup::Nested_1::Wrapper # ./spec/wrapper_spec.rb:7:in `block (2 levels) in <top (required)>' Finished in 0.00106 seconds 1 example, 1 failure
40. class Wrapper end
41. class Wrapper def self.wrap(sentence, column) end end
42. Running: spec/wrapper_spec.rb F Failures: 1) Wrapper wrap de string vazia Failure/Error: Wrapper.wrap("", 10).should == "" expected: "" got: nil (using ==) # ./spec/wrapper_spec.rb:7:in `block (2 levels) in <top (required)>' Finished in 0.00047 seconds 1 example, 1 failure Failed examples: rspec ./spec/wrapper_spec.rb:6 # Wrapper wrap de string vazia
43. class Wrapper def self.wrap(sentence, column) return "" end end
44. rspec ./spec/wrapper_spec.rb:6 # Wrapper wrap de string vazia Running: spec/wrapper_spec.rb . Finished in 0.00055 seconds 1 example, 0 failures
45. class Wrapper def self.wrap(sentence, column) return "" end end
46. describe "Wrapper" do it "wrap de string vazia" do Wrapper.wrap("", 10).should == "" end it "should not wrap small strings" do Wrapper.wrap("word", 10).should == "word" end end
47. class Wrapper def self.wrap(sentence, column) return sentence end end
48. it "should wrap when no spaces found" do Wrapper.wrap("abcdef", 3).should == "abc\ndef" end \n
49. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence else return sentence[0, column] + "\n" + sentence[column..-1] end end end
50. it "should wrap many lines" do Wrapper.wrap("abcdefghi", 3).should == "abc\ndef\nghi" end
51. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence else return sentence[0, column] + "\n" + sentence[column..-1] end end end
52. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence else return sentence[0, column] + "\n" + wrap(sentence[column..-1], column) end end end
53. it "should wrap on the space" do Wrapper.wrap("word word", 5).should == "word\nword" end
54. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence elsif sentence[column-1] == " " return sentence[0, column-1] + "\n" + wrap(sentence[column..-1], column) else return sentence[0, column] + "\n" + wrap(sentence[column..-1], column) end end end
55. it "should wrap earlier if a space is the last char" do Wrapper.wrap("word word", 6).should == "word\nword" end
56. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence end space_idx = sentence[0, column].rindex(" ") if space_idx return sentence[0, space_idx] + "\n" + wrap(sentence[space_idx +1..-1], column) else return sentence[0, column] + "\n" + wrap(sentence[column..-1], column) end end end
57. it "should wrap well before boundaries" do Wrapper.wrap("word word", 3).should == "wor\nd\nwor\nd" end
58. it "should wrap on the next char if it is a space" Wrapper.wrap("word word", 4).should == "word\nword" end
59. def self.wrap(sentence, column) if sentence.length <= column return sentence end space_idx = sentence[0, column].rindex(" ") if space_idx return sentence[0, space_idx] + "\n" + wrap(sentence[space_idx +1..-1], column) elsif sentence[column] == " " return sentence[0, column] + "\n" + wrap(sentence[column+1..-1], column) else return sentence[0, column] + "\n" + wrap(sentence[column..-1], column) end end
60. class Wrapper def self.wrap(sentence, column) if sentence.length <= column return sentence end space_idx = sentence[0, column].rindex(" ") if space_idx return sentence[0, space_idx] + "\n" + wrap(sentence[space_idx +1..-1], column) elsif sentence[column] == " " return sentence[0, column] + "\n" + wrap(sentence[column+1..-1], column) else return sentence[0, column] + "\n" + wrap(sentence[column..-1], column) end end end
61. class Wrapper attr_accessor :column def self.wrap(sentence, column) Wrapper.new(column).wrap(sentence) end def initialize(column) self.column = column end def wrap(sentence) return sentence if sentence.length <= column space_idx = sentence[0, column].rindex(" ") if space_idx break_at_pos(sentence, space_idx, 1) elsif sentence[column] == " " break_at_pos(sentence, column, 1) else break_at_pos(sentence, column, 0) end end def break_at_pos(sentence, position_to_break, offset_for_next_line) sentence[0, position_to_break] + "\n" + wrap(sentence[(position_to_break +offset_for_next_line)..-1]) end end
62. TDD
63. Resources
64. Resources How to write evil untestable code - http://goo.gl/wMqN3 MSDN Testing javascript with QUnit - http://goo.gl/wqoeg Unit Testing on Visual Studio - http://goo.gl/Lp5RR Desenv. Orientado a Testes - http://goo.gl/uK3Ny
65. https://speakerdeck.com/u/danteregis dante@danteregis.com