# File lib/action_dispatch/testing/assertions/routing.rb, line 73
      def assert_generates(expected_path, options, defaults={}, extras = {}, message=nil)
        if expected_path =~ %r{://}
          begin
            uri = URI.parse(expected_path)
            expected_path = uri.path.to_s.empty? ? "/" : uri.path
          rescue URI::InvalidURIError => e
            raise ActionController::RoutingError, e.message
          end
        else
          expected_path = "/#{expected_path}" unless expected_path.first == '/'
        end
        # Load routes.rb if it hasn't been loaded.

        generated_path, extra_keys = @routes.generate_extras(options, defaults)
        found_extras = options.reject {|k, v| ! extra_keys.include? k}

        msg = build_message(message, "found extras <?>, not <?>", found_extras, extras)
        assert_block(msg) { found_extras == extras }

        msg = build_message(message, "The generated path <?> did not match <?>", generated_path,
            expected_path)
        assert_block(msg) { expected_path == generated_path }
      end