module ActionView::TestCase::Behavior

def respond_to_missing?(name, include_private = false)
  begin
    routes = defined?(@controller) && @controller.respond_to?(:_routes) && @controller._routes
  rescue
    # Don't call routes, if there is an error on _routes call
  end
  routes &&
    (routes.named_routes.route_defined?(name) ||
     routes.mounted_helpers.method_defined?(name))
end