code: public function addRoute($httpMethod, $routeData, $handler)
      {
          $this->wrappedGenerator->addRoute($httpMethod, $routeData, $handler);
      }
docs: Adds a route to the data generator. The route data uses the
  same format that is returned by RouterParser::parser().
  
  The handler doesn't necessarily need to be a callable, it
  can be arbitrary data that will be returned when the route
  matches.
  
  @param string $httpMethod
  @param array  $routeData
  @param mixed  $handler