Responsive Describe module for running request specs under different resolutions with poltergeist

responsive_describe.rb

# This module allows you to run your request specs in a responsive mode quite easily
#
# Requirement: It requries Poltergeist, but could work with any capybara driver with a resize method
#
# Instructions:
#
#   0. Setup Poltergeist and register the driver
#   1. Drop this module in your spec/support folder
#   2. Include this module before your describe
#   3. Use a responsive: true param in describe to enable responsive requests. We will need a js:true to enable poltergeist
#
# Example:
#
### include ResponsiveDescribe
### 
### describe "Academic Filter", js: true, responsive: true do
###   ...
### end
#
# It will duplicate your describe with a [Responsive] in the description
#
module ResponsiveDescribe

  def self.included klass
    klass.module_eval do
      def self.describe(*args, &example_group_block)
        options = args.extract_options!
        item_args = args.collect(&:dup) + [options.dup]
        item_args.delete(:responsive)
        if options.delete(:responsive)
          responsive_item_args = args.collect(&:dup) + [options.dup]
          responsive_item_args[0] << " [Responsive]"

          super(*responsive_item_args) do
            class_exec do
              before :each do
                page.driver.resize(480, 800)
              end
              after :each do
                page.driver.resize(1024, 768)
              end
            end
            class_exec(&example_group_block)
          end
        end

        super(*item_args) do
          class_exec(&example_group_block)
        end
      end
    end
  end
end