Cucumber hook and additional environment config for testing different screen resolutions with Capybara, Poltergeist and PhantomJS

cucumber.yml

<%
CUCUMBER_PROFILES = %w{desktop mobile tablet_landscape tablet_portrait}

rerun = File.file?('tmp/rerun.txt') ? IO.read('tmp/rerun.txt') : ""
rerun_opts = rerun.to_s.strip.empty? ? "--format #{ENV['CUCUMBER_FORMAT'] || 'progress'} features" : "--format #{ENV['CUCUMBER_FORMAT'] || 'pretty'} #{rerun}"
std_opts = "--format #{ENV['CUCUMBER_FORMAT'] || 'pretty'} --tags ~@wip -r features"
%>
default: <%= std_opts %> features
wip: --tags @wip:3 --wip features
rerun: <%= rerun_opts %> --format rerun --out tmp/rerun.txt --strict --tags ~@wip

<% CUCUMBER_PROFILES.each do |profile| %>
  <%
  profile_rerun = File.file?("tmp/rerun_#{profile}.txt") ? IO.read("tmp/rerun_#{profile}.txt") : ""
  profile_rerun_opts = profile_rerun.to_s.strip.empty? ? "--format #{ENV['CUCUMBER_FORMAT'] || 'progress'} features" : "--format #{ENV['CUCUMBER_FORMAT'] || 'pretty'} #{profile_rerun}"
  %>

<%= profile %>: <%= std_opts %> features --tags @common,@<%= profile %> SCREEN_MODE=<%= profile %>
<%= profile %>_rerun: <%= profile_rerun_opts %> -r features --tags @common,@<%= profile %> SCREEN_MODE=<%= profile %>
<% end %>

untagged: <%= std_opts %> features --tags ~@common --tags ~@desktop --tags ~@mobile --tags ~@tablet_portrait --tags ~@tablet_landscape

screen.rb

require 'capybara/poltergeist'

def set_screen_size_by_profile
  $screen_mode = ENV['SCREEN_MODE'] || 'desktop'

  @window_width, @window_height = case $screen_mode
  when 'desktop'
    [1200, 1024]
  when 'tablet_landscape'
    [1020, 600]
  when 'tablet_portrait'
    [620, 800]
  when 'mobile'
    [340, 480]
  end
  puts "screen size was set to #{@window_width}*#{@window_height}"
end

def screen_is_mobile?
  $screen_mode == 'mobile'
end

def screen_is_desktop?
  $screen_mode == 'desktop'
end

def screen_is_tablet_landscape?
  $screen_mode == 'tablet_landscape'
end

def screen_is_tablet_portrait?
  $screen_mode == 'tablet_portrait'
end

require File.expand_path(File.join(File.dirname(__FILE__), "..", "support", "selectors"))

# include warden mocking helpers
include Warden::Test::Helpers
Warden.test_mode!

Capybara::Screenshot.autosave_on_failure = true

module WithinHelpers
  def with_scope(locator)
    locator ? within(*selector_for(locator)) { yield } : yield
  end
end
World(WithinHelpers)

set_screen_size_by_profile
Capybara.javascript_driver = :poltergeist
Capybara.register_driver :poltergeist do |app|
  Capybara::Poltergeist::Driver.new(app,
                                    # inspector: true,
                                    window_size: [@window_width, @window_height],
                                    js_errors: true,
                                    timeout: 60)
end

Capybara.register_driver :poltergeist_scroll do |app|
  Capybara::Poltergeist::Driver.new(app,
                                    window_size: [@window_width, 400],
                                    js_errors: true,
                                    timeout: 60)
end

Capybara.register_driver :poltergeist_without_js_errors do |app|
  Capybara::Poltergeist::Driver.new(app,
                                    window_size: [@window_width, @window_height],
                                    js_errors: false,
                                    timeout: 60)
end

# override for testing
module Airbrake
  def self.notify(exception, opts = {})
    # do nothing.
  end
end

module Capybara
  module Node
    class Element
      def hover
        @session.driver.browser.action.move_to(self.native).perform
      end
    end
  end
end if Capybara.current_driver == :selenium