Agile Web Development with Rails, Edition 5

25.1 RSpec

edit Gemfile

group :development, :test do

  gem 'rspec-rails'

bundle install --local

Resolving dependencies...

Using rake 12.2.1

Using concurrent-ruby 1.0.5

Using i18n 0.9.1

Using minitest 5.10.3

Using thread_safe 0.3.6

Using tzinfo 1.2.4

Using activesupport 5.2.0.alpha from source at `/home/rubys/git/rails`

Using builder 3.2.3

Using erubi 1.7.0

Using mini_portile2 2.3.0

Using nokogiri 1.8.1

Using rails-dom-testing 2.0.3

Using crass 1.0.2

Using loofah 2.1.1

Using rails-html-sanitizer 1.0.3

Using actionview 5.2.0.alpha from source at `/home/rubys/git/rails`

Using rack 2.0.3

Using rack-test 0.7.0

Using actionpack 5.2.0.alpha from source at `/home/rubys/git/rails`

Using nio4r 2.1.0

Using websocket-extensions 0.1.3

Using websocket-driver 0.6.5

Using actioncable 5.2.0.alpha from source at `/home/rubys/git/rails`

Using globalid 0.4.1

Using activejob 5.2.0.alpha from source at `/home/rubys/git/rails`

Using mini_mime 1.0.0

Using mail 2.7.0

Using actionmailer 5.2.0.alpha from source at `/home/rubys/git/rails`

Using activemodel 5.2.0.alpha from source at `/home/rubys/git/rails`

Using activemodel-serializers-xml 1.0.2

Using arel 9.0.0.alpha from source at `/home/rubys/git/arel`

Using activerecord 5.2.0.alpha from source at `/home/rubys/git/rails`

Using activestorage 5.2.0.alpha from source at `/home/rubys/git/rails`

Using public_suffix 3.0.1

Using addressable 2.5.2

Using net-ssh 4.2.0

Using net-scp 1.2.1

Using sshkit 1.15.0

Using airbrussh 1.3.0

Using io-like 0.3.0

Using archive-zip 0.7.0

Using bcrypt 3.1.11

Using bindex 0.5.0

Using msgpack 1.1.0

Using bootsnap 1.1.5

Using bundler 1.16.0

Using byebug 9.1.0

Using capistrano 3.10.0

Using capistrano-bundler 1.3.0

Using capistrano-passenger 0.2.0

Using capistrano-rails 1.3.0

Using capistrano-rvm 0.1.2

Using xpath 2.1.0

Using capybara 2.15.4

Using ffi 1.9.18

Using childprocess 0.8.0

Using chromedriver-helper 1.1.0

Using coffee-script-source 1.12.2

Using execjs 2.7.0

Using coffee-script 2.4.1

Using method_source 0.9.0

Using thor 0.19.4

Using railties 5.2.0.alpha from source at `/home/rubys/git/rails`

Using coffee-rails 4.2.2

Using diff-lcs 1.3

Using et-orbi 1.0.8

Using i18n-js 3.0.2

Using multi_json 1.12.2

Using jbuilder 2.7.0

Using mono_logger 1.1.0

Using mustermann 1.0.1

Using mysql2 0.4.9

Using pg 0.19.0

Using puma 3.10.0

Using queue_classic 3.2.0.RC1 from source at `/home/rubys/git/queue_classic`

Using rack-protection 2.0.0

Using rack-proxy 0.6.2

Using sprockets 3.7.1

Using sprockets-rails 3.2.1

Using rails 5.2.0.alpha from source at `/home/rubys/git/rails`

Using rb-fsevent 0.10.2

Using rb-inotify 0.9.9 from source at `/home/rubys/git/rb-inotify`

Using redis 4.0.1

Using redis-namespace 1.6.0

Using tilt 2.0.8

Using sinatra 2.0.0

Using vegas 0.1.11

Using resque 1.27.4

Using rufus-scheduler 3.4.2

Using resque-scheduler 4.3.0 from source at `/home/rubys/git/resque-scheduler`

Using rspec-support 3.7.0

Using rspec-core 3.7.0

Using rspec-expectations 3.7.0

Using rspec-mocks 3.7.0

Using rspec-rails 3.7.1

Using rubyzip 1.2.1

Using sass-listen 4.0.0

Using sass 3.5.3

Using sass-rails 5.0.6 from source at `/home/rubys/git/sass-rails`

Using selenium-webdriver 3.7.0

Using spring 2.0.2

Using sqlite3 1.3.13

Using turbolinks-source 5.0.3

Using turbolinks 5.0.1

Using uglifier 3.2.0

Using web-console 3.5.1 from source at `/home/rubys/git/web-console`

Using webpacker 3.0.2

Bundle complete! 30 Gemfile dependencies, 107 gems now installed.

Use `bundle info [gemname]` to see where a bundled gem is installed.

rails generate rspec:install

      create  .rspec

      create  spec

      create  spec/spec_helper.rb

      create  spec/rails_helper.rb

edit spec/rails_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'

require 'spec_helper'

ENV['RAILS_ENV'] ||= 'test'

require File.expand_path('../../config/environment', __FILE__)

# Prevent database truncation if the environment is production

abort("The Rails environment is running in production mode!") if Rails.env.production?

require 'rspec/rails'

# Add additional requires below this line. Rails is not loaded until this point!

# Requires supporting ruby files with custom matchers and macros, etc, in

# spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are

# run as spec files by default. This means that files in spec/support that end

# in _spec.rb will both be required and run as specs, causing the specs to be

# run twice. It is recommended that you do not name files matching this glob to

# end with _spec.rb. You can configure this pattern with the --pattern

# option on the command line or in ~/.rspec, .rspec or `.rspec-local`.

# The following line is provided for convenience purposes. It has the downside

# of increasing the boot-up time by auto-requiring all files in the support

# directory. Alternatively, in the individual `*_spec.rb` files, manually

# require only the support files necessary.

# Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }

# Checks for pending migrations and applies them before tests are run.

# If you are not using ActiveRecord, you can remove this line.

ActiveRecord::Migration.maintain_test_schema!

RSpec.configure do |config|

  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures

  config.fixture_path = "#{::Rails.root}/test/fixtures"

  # If you're not using ActiveRecord, or you'd prefer not to run each of your

  # examples within a transaction, remove the following line or assign false

  # instead of true.

  config.use_transactional_fixtures = true

  # RSpec Rails can automatically mix in different behaviours to your tests

  # based on their file location, for example enabling you to call `get` and

  # `post` in specs under `spec/controllers`.

  # You can disable this behaviour by removing the line below, and instead

  # explicitly tag your specs with their type, e.g.:

  #     RSpec.describe UsersController, :type => :controller do

  #       # ...

  #     end

  # The different available types are documented in the features, such as in

  # https://relishapp.com/rspec/rspec-rails/docs

  config.infer_spec_type_from_file_location!

  # Filter lines from Rails gems in backtraces.

  config.filter_rails_from_backtrace!

  # arbitrary gems may also be filtered via:

  # config.filter_gems_from_backtrace("gem name")

end

rails generate rspec:model Cart

      create  spec/models/cart_spec.rb

edit spec/models/cart_spec.rb

require 'rails_helper'

RSpec.describe Cart, type: :model do

  fixtures :products

  subject(:cart) { Cart.new }

  let(:book_one) { products(:ruby) }

  let(:book_two) { products(:two) }

  describe "#add_product" do

    context "adding unique products" do

      before do

        cart.add_product(book_one).save!

        cart.add_product(book_two).save!

end

      it "has two line items" do

        expect(cart.line_items.size).to eq(2)

end

      it "has a total price of the two items' price" do

        expect(cart.total_price).to eq(book_one.price + book_two.price)

end

end

    context "adding duplicate products" do

      before do

        cart.add_product(book_one).save!

        cart.add_product(book_one).save!

end

      it "has one line item" do

        expect(cart.line_items.size).to eq(1)

end

      it "has a line item with a quantity of 2" do

        expect(cart.line_items.first.quantity).to eq(2)

end

      it "has a total price of twice the product's price" do

        expect(cart.total_price).to eq(book_one.price * 2)

end

end

end

end