gistfile1.rb

Sinatra::Default.set(:environment, :test)

module RackTestSinatra
  include Rack::Test::Methods

  def app
    Sinatra::Application
  end

  alias :response :last_response
  alias :request  :last_request
  alias :follow!  :follow_redirect!

  def method_missing(name, *args, &block)
    if response && response.respond_to?(name)
      response.send(name, *args, &block)
    else
      super
    end
  end
end