The document discusses the benefits of test-driven development (TDD) and automated testing. It provides an example of using TDD to develop a simple calculator application, starting with writing tests for the desired functionality before implementing the code. As tests are added and code is refined, TDD helps ensure quality, catch errors, and drive good design. When practiced regularly through techniques like TDD and continuous integration, automated testing allows software to be developed and maintained efficiently as a team over time.

1. TESTES AUTOMATIZADOS O
TIME E O CLIENTE SAEM
GANHANDO!

2. MAURO QUEM…

5. MAUROGEORGE.COM.BR

6. POR QUE DEVEMOS TESTAR?

7. POR QUE DEVEMOS TESTAR?
Sistemas grandes sem testes

8. POR QUE DEVEMOS TESTAR?
Teste é investimento

9. POR QUE DEVEMOS TESTAR?
Sistemas sem testes

10. POR QUE DEVEMOS TESTAR?
Sistemas pequenos viram grandes

11. POR QUE DEVEMOS TESTAR?
Mas isso vende?

12. TESTES AUTOMATIZADOS

13. TDD
Test-driven development

14. TDD
O que é

15. calculator_spec.rb
RSpec.describe Calculator do!
!
describe ‘.sum' do!
!
it 'sum 2 and 2' do!
expect(Calculator.sum(2, 2)).to eq(4)!
end!
end!
end!

16. console
$ rspec spec/calculator_spec.rb!
!
/path/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:481:in
`load_missing_constant': Unable to autoload constant Calculator, expected /path/
calculator.rb to define it (LoadError)!
! from /path/gems/activesupport-4.1.4/lib/active_support/dependencies.rb:180:in
`const_missing'!
! from /path/spec/calculator_spec.rb:3:in `<top (required)>'!
! from /path/gems/rspec-core-3.0.4/lib/rspec/core/configuration.rb:1058:in `load'!
! from /path/gems/rspec-core-3.0.4/lib/rspec/core/configuration.rb:1058:in `block in
load_spec_files'!
! from /path/gems/rspec-core-3.0.4/lib/rspec/core/configuration.rb:1058:in `each'!
! from /path/gems/rspec-core-3.0.4/lib/rspec/core/configuration.rb:1058:in
`load_spec_files’ …

17. calculator.rb
class Calculator!
!
def self.sum(a, b)!
4!
end!
end

18. console
$ rspec spec/calculator_spec.rb!
!
Run options: include {:focus=>true}!
!
All examples were filtered out; ignoring {:focus=>true}!
!
Calculator!
.sum!
sum 2 and 2!
!
Finished in 0.20637 seconds (files took 4.72 seconds to load)!
1 example, 0 failures!
!
Randomized with seed 49032

19. calculator_spec.rb
RSpec.describe Calculator do!
!
describe '.sum' do!
!
it 'sum 2 and 2' do!
expect(Calculator.sum(2, 2)).to eq(4)!
end!
!
it 'sum 3 and 2' do!
expect(Calculator.sum(3, 2)).to eq(5)!
end!
end!
end!

20. console
1) Calculator.sum sum 3 and 2!
Failure/Error: expect(Calculator.sum(3, 2)).to eq(5)!
!
expected: 5!
got: 4!
!
(compared using ==)!
# ./spec/calculator_spec.rb:12:in `block (3 levels) in <top (required)>'!
!
Finished in 0.24562 seconds (files took 4.67 seconds to load)!
2 examples, 1 failure!
!
Failed examples:!
!
rspec ./spec/calculator_spec.rb:11 # Calculator.sum sum 3 and 2

21. calculator.rb
class Calculator!
!
def self.sum(a, b)!
a + b!
end!
end!

22. console
Run options: include {:focus=>true}!
!
All examples were filtered out; ignoring {:focus=>true}!
!
Calculator!
.sum!
sum 2 and 2!
sum 3 and 2!
!
Finished in 0.20995 seconds (files took 4.78 seconds to load)!
2 examples, 0 failures!
!
Randomized with seed 64301

23. TDD
Baby steps

24. TDD
Refactoring

25. TDD
Design de código

26. TDD
Simplicidade

27. TDD
Qualidade

28. TDD
Coding Dojo

29. BDD
Behavior-driven development

30. calculator_spec.rb
RSpec.describe Calculator do!
!
describe '.sum' do!
!
it 'sum positive values' do!
expect(Calculator.sum(2, 2)).to eq(4)!
end!
!
it 'sum negative values' do!
expect(Calculator.sum(-3, -2)).to eq(-5)!
end!
end!
end!

31. DIA A DIA

32. DIA A DIA
Começar o projeto já com os testes

33. DIA A DIA
TDD/BDD

34. DIA A DIA
100% de cobertura de testes

35. DIA A DIA
Código coletivo

36. DIA A DIA
Testes como documentação

37. DIA A DIA
Projeto não para se alguém do time for para a NASA

38. DIA A DIA
Build de dez minutos

39. DIA A DIA
Integração continua

40. DIA A DIA
Deploy continuo

41. XP

42. XP
Coragem

43. XP
Simplicidade

44. OBRIGADO!

45. MAUROGEORGE.COM.BR