Using xhr with rspec + rack/test

xhr.rb

module XhrHelpers

  def xhr(path, params = {})
    verb = params.delete(:as) || :get
    send(verb,path, params, "HTTP_X_REQUESTED_WITH" => "XMLHttpRequest")
  end
  alias_method :ajax, :xhr
end

RSpec.configuration.include XhrHelpers, :type => :controller