RSpec Best Friends @ TDC São Paulo 2014
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Transcript of RSpec Best Friends @ TDC São Paulo 2014
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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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sintaxe de expectativaRSpec
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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) pokemon.nome_completo.should eq('Charizard - 6')end
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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
it { expect(subject).to be_a(ActiveRecord::Base) }
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spec/models/pokemon_spec.rb
it { should be_a(ActiveRecord::Base) }
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spec/models/pokemon_spec.rb
it { is_expected.to be_a(ActiveRecord::Base) }
Somente RSpec 3
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spec/spec_helper.rb
RSpec.configure do |config| # ... config.expect_with :rspec do |c| c.syntax = :expect endend
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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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não teste apenas o happy pathRSpec
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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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spec/models/pokemon_spec.rb
describe '#nome_completo' do it 'exibe o nome e o id nacional quando possui os valores' do pokemon = Pokemon.new(nome: 'Charizard', id_nacional: 6) expect(pokemon.nome_completo).to eq('Charizard - 6') end
it 'é nil quando não possui o nome e o id nacional' do pokemon = Pokemon.new expect(pokemon.nome_completo).to be_nil endend
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contextos para a melhor descriçãoRSpec
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spec/models/pokemon_spec.rb
describe '#nome_completo' do context 'quando possui nome e o id nacional' do it 'exibe o nome e o id nacional' do # ... end end
context 'quando não possui o nome e o id nacional' do it 'é nil' do # ... end endend
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de!nindo 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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utilize sempre os matchersRSpec
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spec/models/pokemon_spec.rb
it 'é nil' do expect(subject.nome_completo).to eq(nil)end
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spec/models/pokemon_spec.rb
it 'é nil' do expect(subject.nome_completo).to be_nilend
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não use shouldRSpec
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spec/models/pokemon_spec.rb
it 'should have the name and the national_id' do expect(pokemon.full_name).to eq('Charizard - 6')end
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spec/models/pokemon_spec.rb
it 'does have the name and the national_id' do expect(pokemon.full_name).to eq('Charizard - 6')end
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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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https://github.com/mongoid/mongoidhttps://github.com/bbatsov/ruby-style-guidehttps://github.com/bbatsov/rails-style-guide
coding styleRSpec
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Testes que acessam rede
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Testes lentosTestes 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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webmockTestes que acessam rede
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webmock: feedback rápidoTestes que acessam rede
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bash
Failure/Error: CriadorPokemon.new(6) WebMock::NetConnectNotAllowedError: Real HTTP connections are disabled. Unregistered request: GET http://pokeapi.co/api/v1/pokemon/6/ with headers {'Accept'=>'*/*', 'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3', 'Host'=>'pokeapi.co', 'User-Agent'=>'Ruby'}
You can stub this request with the following snippet:
stub_request(:get, "http://pokeapi.co/api/v1/pokemon/6/"). with(:headers => {'Accept'=>'*/*', 'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3', 'Host'=>'pokeapi.co', 'User-Agent'=>'Ruby'}).to_return(:status => 200, :body => "", :headers => {})
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webmock: forjando a respostaTestes que acessam rede
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spec/services/criador_pokemon_spec.rb
describe 'pokemon criado' do
before do body = '{' \ ' "name": "Charizard"' \ '}' stub_request(:get, 'http://pokeapi.co/api/v1/pokemon/6/') .to_return(status: 200, body: body, headers: {}) criador_pokemon.criar endend
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webmock: forjando com cURLTestes que acessam rede
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bash
$ curl -is http://pokeapi.co/api/v1/pokemon/6/ > \spec/fixtures/services/criador_pokemon/resposta.txt
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spec/services/criador_pokemon_spec.rb
describe 'pokemon criado' do
before do caminho_arquivo = 'spec/fixtures/services/criador_pokemon/resposta.txt' arquivo_resposta = File.new(caminho_arquivo) stub_request(:get, 'http://pokeapi.co/api/v1/pokemon/6/') .to_return(arquivo_resposta) criador_pokemon.criar endend
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vcrTestes que acessam rede
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vcr: con!guraçãoTestes 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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!xtures 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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con!gurandofactory_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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dependent attributesfactory_girl
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spec/factories/artigos.rb
factory :artigo do titulo 'Diversas dicas do RSpec' conteudo { "Conteúdo do artigo #{titulo}. Aprovado: #{aprovado}" }end
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sequencefactory_girl
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spec/factories/artigos.rb
factory :artigo do sequence(:titulo) { |n| "Diversas dicas do RSpec #{n}" } conteudo { "Conteúdo do artigo #{titulo}. Aprovado: #{aprovado}" }end
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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 #{titulo}. Aprovado: #{aprovado}" } usuarioend
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aliasesfactory_girl
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spec/factories/artigos.rb
factory :usuario, aliases: [:autor] do nome 'Mauro' email { "#{nome}@helabs.com.br" }end
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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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lintfactory_girl
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spec/support/factory_girl.rb
RSpec.configure do |config|
config.before(:suite) do begin DatabaseCleaner.start FactoryGirl.lint ensure DatabaseCleaner.clean end endend
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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, 8, 6, 17, 15)) 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, 8, 7, 17, 15)) do expect(subject).to include(pokemon_escolhido_ontem) end endend
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simplecov
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veri!cando 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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ActiveModelActiveRecord
ActionController
os matchersshoulda-matchers
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https://github.com/bmabey/email-spechttps://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