RSpec Love

Transcript

1. RSpec Love @lmarinho

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3. RSpec Love @lmarinho

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5. RSpec Love @lmarinho

6. RSpec Love @lmarinho

7. RSpec Love @lmarinho

8. Code Spec

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11. DISCLAIMER: É SÓ A MINHA OPINIÃO

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13. Use expect foo.should eq(bar) foo.should_not eq(bar)

14. Use expect expect(foo).to eq(bar) expect(foo).not_to eq(bar)

15. Use expect .should class Proxy < BasicObject def initialize(target) @target

    = target end def method_missing(*args, &block) @target.__send__(*args, &block) end ... end
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17. Use describe Referencia estrutura do código testado

18. Use describe describe MyClass do ... describe ‘#method’ do ...

    describe ‘.class_method’ do ...
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20. Use context Define um estado ou entrada no sistema

21. Use context context ‘when the user has no username’ do

    ... context ‘when the account balance is 0.0’ do ...
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23. Contexto Expectativa

24. Use let Let ajuda a definir nomes relacionados a contextos

25. Use let let(:email) { ‘email@example.com’ }

26. Use let let(:email) { ‘email@example.com’ } let(:user) { User.new(email: email)

    } context ‘when there is no email’ do let(:email) { ‘’ } it ‘is invalid’ do expect(user).to be_invalid end end

27. Use let Prefira ‘let’ a ‘before’, pois o primeiro é

    lazy-loaded
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29. Use subject Subject ajuda a evitar repetição de referências

30. Use subject describe User do it ‘has the expected attributes’

    do user = User.new expect(user).to respond_to :name expect(user).to respond_to :email expect(user).to respond_to :age end end

31. Use subject describe User do subject { User.new } it

    { should respond_to :name } it { should respond_to :email } it { should respond_to :age } end
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33. Use “skim its” Skim milk < 0.3% gordura Skim it

    1 expectation & < 4 LOC
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35. Crie métodos Métodos ajudam a evitar repetições desnecessárias

36. Crie métodos it { should_create_report_named('Volume Evolution') } it { should_create_report_named('Top

    Users') } it { should_create_report_named('Top Terms') } it { should_create_report_named('Gender Report') }

37. Crie métodos Métodos também ajudam a evitar loops em specs

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39. Reuse specs É possível reusar specs através de shared_examples

40. Reuse specs shared_examples ‘a collection’ do let(:collection) { described_class.new([7, 2,

    4]) } context ‘when initialized with 3 items’ do it ‘says it has three items’ do expect(collection.size).to eq(3) end end end

41. Reuse specs describe Array do it_behaves_like ‘a collection’ end describe

    Set do it_behaves_like ‘a collection’ end
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43. Use factories As vezes...

44. Use factories Pois FactoryGirl é legal!

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46. Use mocks? Mock-based tests are more coupled to the interfaces

    in your system, while classical tests are more coupled to the implementation of an object’s collaborators. -- Myron Marston

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49. Perguntas?

50. Referências betterspecs.org e links associados