This document discusses parallel testing, shared contexts, and shared examples in RSpec. It provides examples of using the parallel_tests gem to run tests in parallel, creating shared contexts to define common test data across examples, and shared examples to define common expectations that can be included in multiple tests.

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RSpec & Friends 2:
Parallel Tests
Controllers
Shared Groups
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Parallel Tests
# Gemfile
group :development do
gem 'parallel_tests'
end
# Создаем и обновляем схему БД
rake parallel:create
rake parallel:prepare
# database.yml
test:
database: th_demo_test<%= ENV['TEST_ENV_NUMBER'] || ''%>
# Запускаем
DISABLE_SPRING=1 rake parallel:spec
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Controllers
# Read/Delete methods
describe "GET #index" do
let(:params) { {} }
subject { get :index, params }
context "pagination" do
let(:params) { { page: 1, per_page: 2 } }
it "returns 2 items" do
expect(subject.body).to have_json_size(2).at_path("items")
end
end
end
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Controllers
# Update methods
describe "POST #create" do
let(:form_params) { {} }
let(:params) do
{ format: :json, item: attributes_for(:item).merge(form_params) }
end
subject { post :create, params }
context "invalid params" do
let(:form_params) { { name: nil } }
it "doesn't create new item" do
expect { subject }.not_to change(Item, :count)
end
end
end
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Shared Groups
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Shared
Examples
Shared
Context

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Shared Contexts
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#./spec/shared_context/shared_users.rb
shared_context "users", users: true do
let(:user) { create(:user) }
let(:john) { create(:user, name: "John") }
let(:jack) { create(:user, name: "Jack") }
end
# подключение контекста
include_context "users"
# или с помощью тэгов
context "with users", :users do
# здесь нам доступны user, john и jack
end

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Примеры
7
shared_context "controller", type: :controller do
include_context "users"
end
shared_context "russian locale", ru: true do
around(:each) { |ex| I18n.with_locale(:ru, &ex) }
end
shared_context "english locale", en: true do
around(:each) { |ex| I18n.with_locale(:en, &ex) }
end

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Shared Examples
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# ./spec/shared_examples/valid_examples.rb
shared_examples "valid object" do
specify { is_expected.to be_valid }
end
#./spec/models/user_spec.rb
it_behaves_like "valid object"
# равносильно следующему коду
context "valid object" do
specify { is_expected.to be_valid }
end

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Примеры
9
shared_examples "invalid params" do |message, model: false, code:
403|
context message do
specify { expect(subject).to have_http_status(code) }
if model
specify { expect { subject }.not_to change(model, :count) }
end
end
end
include_examples "invalid params", "missing name", model: Item do
let(:form_params) { { name: nil } }
end