rspec middleware test

rspec_middleware_test.rb

module MiddlewareExampleGroup
  def self.included(base)
    base.class_eval do
      let(:app) {
        Rack::Builder.new do
          eval File.read(Rails.root.join('config.ru'))
        end 
      }   
    end 
  end 

  RSpec.configure do |config|
    config.include self,
      :example_group => { :file_path => %r{spec/requests} }
  end 
end