Merge pull request rails#50638 from dwightwatson/route_defined_bug

Fix undefined method issue in test

Author: rafaelfranca

actionpack/lib/action_dispatch/testing/assertions/routing.rb

@@ -248,7 +248,7 @@ def assert_routing(path, options, defaults = {}, extras = {}, message = nil)
 
       # ROUTES TODO: These assertions should really work in an integration context
       def method_missing(selector, ...)
-        if @controller && @routes&.named_routes.route_defined?(selector)
+        if @controller && @routes&.named_routes&.route_defined?(selector)
           @controller.public_send(selector, ...)
         else
           super