RSpec動作させるまでの設定

rails (5.0.2, 5.0.1, 5.0.0.1)
rspec (3.5.0)
capybara (2.12.1)
poltergeist (1.14.0)

1.ダウンロード、GemFileに関しては以下の記事参照

2.インストール
  bundle exec rails generate rspec:install

3.rails_helper.rbに設定追記(赤文字追記
project/spec/rails_helper.rb

# This file is copied to spec/ when you run 'rails generate rspec:install'
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 'spec_helper'
require 'rspec/rails'
require 'capybara'
require 'capybara/rspec'
require 'capybara/poltergeist'
# 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 migration 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}/spec/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")

  # 結合テストの記法変更(describe -> feature
  config.include Capybara::DSL

  # Devise Gemによるプロキシエラー対応
  config.include Devise::Test::ControllerHelpers, type: :controller
  config.include Devise::Test::ControllerHelpers, type: :view

  # Raisl5対応
  RSpec.configure do |config|
    require 'rails-controller-testing'
    [:controller, :view, :request].each do |type|
      config.include ::Rails::Controller::Testing::TestProcess, :type => type
      config.include ::Rails::Controller::Testing::TemplateAssertions, :type => type
      config.include ::Rails::Controller::Testing::Integration, :type => type
    end
  end

 # Capybara設定
  Capybara.register_driver :poltergeist do |app|
    Capybara::Poltergeist::Driver.new(app, :inspector => true)
  end
  Capybara.javascript_driver = :poltergeist
end

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