Palestra sobre testes automatizados utilizando Test Driven Development com Ruby.

1. DEIXE O TESTE INFECTAR
VOCÊ
AUTOMATIZANDO OS TESTES DE SUAS
APLICA ÕES RUBYÇ
Hercules Lemke Merscher - @hlmerscher

2. IT'S ME, HERCULES.
DESENVOLVEDOR
CRIADOR DO “DOJO, ONDE?”
http://dojoonde.herculesdev.com.br
Integrante do TUX-ES

3. POR QUE AUTOMATIZAR?
PORQUE SIM!!!

4. NÃO É RESPOTA

5. MOTIVOS
Erros recorrentes

6. MOTIVOS
O COMPUTADOR TESTA MUITO MAIS RÁPIDO

7. MOTIVOS
O COMPUTADOR TESTA TUDO SEM CANSAR

8. MOTIVOS
LEI DE MURPHY

10. #include<stdio.h>
int main(){
printf("Hello Worldn");
return 0;
}
NO INÍCIO

11. TESTANDO
$ gcc hello.c -o hello
$ ./hello
Hello World

12. OK

13. MAIS UM POUCO
#include<stdio.h>
int soma(int a, int b){
return a + b;
}
int main(){
printf("%dn", soma(2, 2) );
return 0;
}

14. TESTANDO
$ gcc soma.c -o soma
$ ./soma
4

15. CARA EXPERTO
#include<stdio.h>
int soma(int a, int b){
return a + b;
}
int main(){
printf("A soma de 2+2 = ");
printf("%dn", soma(2, 2) );
return 0;
}

16. NOVAMENTE... COM ÉQUIO
$ gcc soma.c -o soma
$ ./soma
A soma de 2+2 = 4

18. AGORA VAMOS AO MUNDO
REAL?

19. E SE,
TESTASSEMOS PRIMEIRO?

20. É POSSÍVEL!

21. TEST DRIVEN DEVELOPMENT

22. CICLOS DO TDD

23. BABY STEPS

24. FRAMEWORKS DE TESTE
PARA RUBY
Test Unit
http://test-unit.rubyforge.org/
RSpec
http://rspec.info/
Mini Test
http://docs.seattlerb.org/minitest/

25. INSTALANDO
Test Unit
$ gem install test-unit
RSpec
$ gem install rspec
Mini Test
$ gem install minitest

26. TEST UNIT
require "test/unit"
require "./calc"
class CalculadoraTest < Test::Unit::TestCase
def test_soma_2_mais_2
calc = Calculadora.new
assert_equal 4, calc.soma(2, 2)
end
end

27. RED
$ ruby calc_test.rb
Run options:
# Running tests:
E
Finished tests in 0.000854s, 1171.2208 tests/s, 0.0000
assertions/s.
1) Error:
test_soma_2_mais_2(CalculadoraTest):
NameError: uninitialized constant CalculadoraTest::Calculadora
calc_test.rb:5:in `test_soma_2_mais_2'
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

28. RED
class Calculadora
end

29. RED
$ ruby calc_test.rb
Run options:
# Running tests:
E
Finished tests in 0.000807s, 1238.5972 tests/s, 0.0000
assertions/s.
1) Error:
test_soma_2_mais_2(CalculadoraTest):
NoMethodError: undefined method `soma' for
#<Calculadora:0x00000000ef0b00>
calc_test.rb:7:in `test_soma_2_mais_2'
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

30. RED
class Calculadora
def soma(a, b)
– end
–
end

31. RED
$ ruby calc_test.rb
Run options:
# Running tests:
F
Finished tests in 0.001068s, 936.3173 tests/s, 936.3173
assertions/s.
1) Failure:
test_soma_2_mais_2(CalculadoraTest) [calc_test.rb:7]:
<4> expected but was
<nil>.
1 tests, 1 assertions, 1 failures, 0 errors, 0 skips

32. RED
class Calculadora
def soma(a, b)
4
– end
–
end

33. GREEN
$ ruby calc_test.rb
Run options:
# Running tests:
.
Finished tests in 0.000806s, 1240.3147
tests/s, 1240.3147 assertions/s.
1 tests, 1 assertions, 0 failures, 0 errors,
0 skips

34. LEMBRE-SE DO BABY STEPS

35. GREEN
require "test/unit"
require "./calc"
class CalculadoraTest < Test::Unit::TestCase
– # test_soma_2_mais_2
def test_soma_5_mais_3
calc = Calculadora.new
assert_equal 8, calc.soma(5, 3)
end
end

36. RED
$ ruby calc_test.rb
Run options:
# Running tests:
.F
Finished tests in 0.001050s, 1903.8843 tests/s, 1903.8843
assertions/s.
1) Failure:
test_soma_5_mais_3(CalculadoraTest) [calc_test.rb:12]:
<8> expected but was
<4>.
2 tests, 2 assertions, 1 failures, 0 errors, 0 skips

37. RED
class Calculadora
def soma(a, b)
a + b
– end
–
end

38. GREEN
$ ruby calc_test.rb
Run options:
# Running tests:
..
Finished tests in 0.000776s, 2577.7647
tests/s, 2577.7647 assertions/s.
2 tests, 2 assertions, 0 failures, 0 errors,
0 skips

39. RSPEC
require "./calc"
describe Calculadora do
it "deve somar 2 + 2" do
calc = Calculadora.new
calc.soma(2,2).should == 4
end
it "deve somar 5 + 3" do
calc = Calculadora.new
calc.soma(5,3).should == 8
end
end

40. RSPEC
$ rspec calc_spec.rb
FF
Failures:
1) Calculadora deve somar 2 + 2
Failure/Error: calc.soma(2,2).should == 4
expected: 4
got: 0 (using ==)
# ./calc_spec.rb:6:in `block (2 levels) in <top (required)>'
(...)
Finished in 0.00088 seconds
2 examples, 2 failures
Failed examples:
rspec ./calc_spec.rb:4 # Calculadora deve somar 2 + 2
rspec ./calc_spec.rb:9 # Calculadora deve somar 5 + 3

41. RSPEC
..
Finished in 0.0007 seconds
2 examples, 0 failures

42. TESTES DE
REGRESSÃO
Que bicho é esse?

43. ACCEPTANCE TEST DRIVEN
DEVELOPMENT

44. CAPYBARA NO RAILS
$ gem install capybara
…
require “capybara/rails”

45. CAPYBARA
$ rails generate integration_test calc
invoke mini_test
create test/integration/calc_test.rb

46. CAPYBARA
require "test_helper"
class CalcTest < ActionDispatch::IntegrationTest
test "deve somar 2 + 2" do
visit "/"
fill_in "primeiro", with: 2
fill_in "segundo", with: 2
click_on "somar"
assert page.has_content?("resultado = 4")
end
end

47. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.056458s, 17.7121 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
ActionController::RoutingError: No route matches [GET]
"/"
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

48. CAPYBARA
root to: “calc#soma”

49. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.278528s, 3.5903 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
ActionView::MissingTemplate: Missing template calculadora/soma,
application/soma with {:locale=>[:en], :formats=>[:html],
:handlers=>[:erb, :builder]}. Searched in:
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

50. CAPYBARA
$ touch app/views/calc/soma.html.erb

51. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.278528s, 3.5903 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
Capybara::ElementNotFound: Unable to find field
"primeiro"
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

52. CAPYBARA
<%= form_tag("/calc/resultado",
method: “post”) do %>
<%= label_tag(:primeiro, "primeiro") %>
<%= text_field_tag(:primeiro) %>
<% end %>

53. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.278528s, 3.5903 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
Capybara::ElementNotFound: Unable to find field "segundo"
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

54. CAPYBARA
<%= form_tag("/calc/resultado",
method: “post”) do %>
<%= label_tag(:primeiro, "primeiro") %>
<%= text_field_tag(:primeiro) %>
<%= label_tag(:segundo, "segundo") %>
<%= text_field_tag(:segundo) %>
<%= submit_tag(“somar”) %>
<% end %>

55. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.278528s, 3.5903 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
ActionView::Template::Error: No route
matches{:controller=>"calc", :action=>"resultado"}
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

56. CAPYBARA
root to: "calc#soma"
–
post "calc/resultado"

57. CAPYBARA
$ rake minitest
Run options:
# Running tests:
E
Fabulous tests in 0.278528s, 3.5903 tests/s, 0.0000
assertions/s.
1) Error:
test_deve_somar_2_+_2(CalcTest):
ActionView::MissingTemplate: Missing template calc/resultado,
application/resultado with {:locale=>[:en],
:formats=>[:html], :handlers=>[:erb, :builder]}.
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

58. CAPYBARA
CONTROLLER
def resultado
primeiro = params[:primeiro].to_i
segundo = params[:segundo].to_i
@resultado = primeiro + segundo
end
VIEW
$ touch app/views/calc/resultado.html.erb
<p> resultado = <%= @resultado %> </p>

59. CAPYBARA
$ ruby -Itest test/integration/calc_test.rb
Run options:
Run options:
# Running tests:
.
Finished tests in 0.779280s, 1.2832 tests/s, 1.2832
assertions/s.
...
1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

60. LIVROS

61. LIVROS

62. DÚVIDAS?

63. OBRIGADO!
http://herculesdev.com.br/
hlmerscher@gmail.com
twitter.com/hlmerscher
github.com/hlmerscher