rspec best friends @ rupy natal 2014
DESCRIPTION
Nesta palestra veremos: - Boas práticas ao escrever testes utilizando o RSpec - Como escrever testes que acessam rede utilizando o VCR e o WebMock - Apresentando o factory_girl, comparando com as fixtures. E diversas dicas do factory_girl - Testes que dependem de data utilizando o timecop - Coverage de testes com o Simplecov e se devemos ou não atingir os 100% de cobertura de testes - Evitando repetições durante os testes utilizando de matchersTRANSCRIPT
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RSpec Best Friends
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Mauro quem...
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maurogeorge.com.br
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RSpec
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descrevendo melhor os testesRSpec
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spec/models/pokemon_spec.rb
it 'exibe o nome e o id nacional' do pokemon = Pokemon.new(nome: 'Charizard', id_nacional: 6) expect(pokemon.nome_completo).to eq('Charizard - 6')end
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spec/models/pokemon_spec.rb
describe '#nome_completo' do it 'exibe o nome e o id nacional' do pokemon = Pokemon.new(nome: 'Charizard', id_nacional: 6) expect(pokemon.nome_completo).to eq('Charizard - 6') endend
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definindo o sujeitoRSpec
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spec/models/pokemon_spec.rb
context 'quando possui nome e o id nacional' do before do @pokemon = Pokemon.new(nome: 'Charizard', id_nacional: 6) end!
it 'exibe o nome e o id nacional' do expect(@pokemon.nome_completo).to eq('Charizard - 6') endend
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spec/models/pokemon_spec.rb
context 'quando possui nome e o id nacional' do let(:pokemon) do Pokemon.new(nome: 'Charizard', id_nacional: 6) end!
it 'exibe o nome e o id nacional' do expect(pokemon.nome_completo).to eq('Charizard - 6') endend
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spec/models/pokemon_spec.rb
context 'quando possui nome e o id nacional' do subject do Pokemon.new(nome: 'Charizard', id_nacional: 6) end!
it 'exibe o nome e o id nacional' do expect(subject.nome_completo).to eq('Charizard - 6') endend
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ordem aleatória nos testesRSpec
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spec/spec_helper.rb
RSpec.configure do |config| # ... config.order = "random"end
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Testes que acessam rede
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Testes lentos Testes quebradiços
Não poder testar sem rede
introduçãoTestes que acessam rede
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app/services/criador_pokemon.rb
class CriadorPokemon# ...def criar Pokemon.create(nome: nome)end!
private # ... def cria_info resposta = Net::HTTP.get(endpoint) @info = JSON.parse(resposta) endend
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spec/services/criador_pokemon_spec.rb
describe 'pokemon criado' do before do criador_pokemon.criar end!
subject do Pokemon.last end!
it 'possui o nome correto' do expect(subject.nome).to eq('Charizard') endend
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vcrTestes que acessam rede
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vcr: configuraçãoTestes que acessam rede
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spec/support/vcr.rb
VCR.configure do |c| c.cassette_library_dir = 'spec/fixtures/vcr_cassettes' c.hook_into :webmockend
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vcr: feedback rápidoTestes que acessam rede
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bash
Failure/Error: CriadorPokemon.new(6)VCR::Errors::UnhandledHTTPRequestError:!
!
===================================================================== An HTTP request has been made that VCR does not know how to handle: GET http://pokeapi.co/api/v1/pokemon/6/!
There is currently no cassette in use. There are a few ways you can configure VCR to handle this request:!
...
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vcr: forjando a respostaTestes que acessam rede
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spec/services/criador_pokemon_spec.rb
describe 'pokemon criado' do before do VCR.use_cassette('CriadorPokemon/criar') do criador_pokemon.criar end end!
#...!
it 'possui o nome correto' do expect(subject.nome).to eq('Charizard') endend
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vcr: RSpec metadataTestes que acessam rede
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spec/support/vcr.rb
VCR.configure do |c|!
# ... c.configure_rspec_metadata!end
spec/spec_helper.rb
RSpec.configure do |config|!
# ... config.treat_symbols_as_metadata_keys_with_true_values = trueend
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spec/services/criador_pokemon_spec.rb
describe 'pokemon criado', :vcr do before do criador_pokemon.criar end!
#...!
it 'possui o nome correto' do expect(subject.nome).to eq('Charizard') endend
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factory_girl
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fixtures X factoriesfactory_girl
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criando uma factoryfactory_girl
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spec/factories/usuarios.rb
FactoryGirl.define do factory :usuario do nome 'Mauro' email '[email protected]' endend
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configurandofactory_girl
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spec/spec_helper.rb
RSpec.configure do |config| # ... config.include FactoryGirl::Syntax::Methodsend
Em um teste qualquer
let!(:artigo) do create(:artigo)end
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attributes_forfactory_girl
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spec/controllers/posts_controller_spec.rb
describe "POST 'create'" do let(:params) do { artigo: { titulo: 'Meu titulo', conteudo: 'Conteudo do artigo' } } endend
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spec/controllers/posts_controller_spec.rb
describe "POST 'create'" do let(:params) do { artigo: attributes_for(:artigo) } endend
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herançafactory_girl
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spec/factories/artigos.rb
factory :artigo do titulo 'Diversas dicas do RSpec' conteudo 'Conteúdo de Diversas dicas do RSpec'!
factory :artigo_aprovado do aprovado true end!
factory :artigo_nao_aprovado do aprovado false endend
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console rails
FactoryGirl.create(:artigo_aprovado)FactoryGirl.create(:artigo_nao_aprovado)
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traitsfactory_girl
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spec/factories/artigos.rb
factory :artigo do titulo 'Diversas dicas do RSpec' conteudo 'Conteúdo de Diversas dicas do RSpec'!
trait :aprovado do aprovado true end!
trait :nao_aprovado do aprovado false endend
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console rails
FactoryGirl.create(:artigo, :aprovado)FactoryGirl.create(:artigo, :nao_aprovado)
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associaçõesfactory_girl
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console rails
usuario = FactoryGirl.create(:usuario)FactoryGirl.create(:artigo, usuario: usuario)
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spec/factories/artigos.rb
factory :artigo do titulo 'Diversas dicas do RSpec' conteudo 'Conteúdo do artigo' usuarioend
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strategiesfactory_girl
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console rails
pokemon = FactoryGirl.build(:pokemon)
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console rails
pokemon = FactoryGirl.build_stubbed(:pokemon)
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timecop
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app/models/pokemon.rb
class Pokemon < ActiveRecord::Base!
!
scope :escolhidos_ontem, -> do where(escolhido_em: 1.day.ago.midnight..Time.zone.now.midnight) endend
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spec/models/pokemon_spec.rb
describe '.escolhidos_ontem' do let!(:pokemon_escolhido_ontem) do create(:pokemon, escolhido_em: Time.zone.local(2014, 10, 16, 16, 50)) end!
subject do Pokemon.escolhidos_ontem end!
it 'tem o pokemon escolhido ontem' do expect(subject).to include(pokemon_escolhido_ontem) endend
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spec/models/pokemon_spec.rb
describe '.escolhidos_ontem' do!
# ...!
it 'tem o pokemon escolhido ontem' do Timecop.freeze(Time.zone.local((2014, 10, 16, 16, 50)) do expect(subject).to include(pokemon_escolhido_ontem) end endend
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simplecov
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verificando a coberturasimplecov
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spec/spec_helper.rb
require 'simplecov'SimpleCov.start 'rails'
Primeira linha do spec_helper.rb
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O falso 100%simplecov
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app/models/pokemon.rb
class Pokemon < ActiveRecord::Base!
validates :nome, :id_nacional, presence: true scope :escolhidos_ontem, -> do where(escolhido_em: 1.day.ago.midnight..Time.zone.now.midnight) endend
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Não teste associações, validações ou escopos do Active Record
simplecov
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teste associações, validações e escopos do Active Record
simplecov
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devo ter 100% de cobertura de testes?simplecov
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shoulda-matchers
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app/models/pokemon.rb
class Pokemon < ActiveRecord::Base!
validates :nome, :id_nacional, presence: true validates :id_nacional, numericality: { only_integer: true, greater_than: 0 }end
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spec/models/pokemon_spec.rb
describe 'validações' do!
it { is_expected.to validate_presence_of(:nome) } it { is_expected.to validate_presence_of(:id_nacional) } it { is_expected.to validate_numericality_of(:id_nacional).only_integer .is_greater_than(0) }end
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ActiveModel ActiveRecord
ActionController
os matchersshoulda-matchers
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https://github.com/bmabey/email-spec https://github.com/philostler/rspec-sidekiq
https://github.com/evansagge/mongoid-rspec
além do shoulda-matchersshoulda-matchers
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Obrigado!
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maurogeorge.com.br