Testing cache helpers with Rails 3.1 and Rspec

example_helpers.rb

# spec/support/example_helpers.rb
module ExampleHelpers

    module CachingTestHelpers
        ActionController::Base.public_class_method :page_cache_path

        module ResponseHelper
            def action_cached?(request)
                request.path.is_action_cached?
            end

            def page_cached?(request)
                request.path.is_page_cached?
            end
        end
        ActionDispatch::TestResponse.send(:include, ResponseHelper)
    end
end

class String
    def is_action_cached?
        Rails.cache.exist?("views/www.example.com#{self}")
    end

    def is_page_cached?
        File.exists? ActionController::Base.page_cache_path(self)
    end
end


RSpec.configure do |config|
    config.include ExampleHelpers::CachingTestHelpers, :type => :request
end