module RSpec::Rails::ControllerExampleGroup::ClassMethods

def controller(base_class = nil, &body)
  base_class ||= RSpec.configuration.infer_base_class_for_anonymous_controllers? ?
                   controller_class :
                   ApplicationController
  metadata[:example_group][:described_class] = Class.new(base_class) do
    def self.name; "AnonymousController"; end
  end
  metadata[:example_group][:described_class].class_eval(&body)
  orig_routes = nil
  before do
    orig_routes = self.routes
    self.routes  = ActionDispatch::Routing::RouteSet.new.tap { |r|
      r.draw { resources :anonymous }
    }
  end
  after do
    self.routes  = orig_routes
    @orig_routes = nil
  end
end