#3384913 setting up route tests for POST requests.

modules/support_ticket/src/SupportTicketTypeForm.php

@@ -266,7 +266,7 @@ class SupportTicketTypeForm extends EntityForm {
         ->addStatus($this->t('The support ticket type %name has been added.', $t_args));
 
      $context = array_merge($t_args,
-       ['link' => $this->entity->toUrl('collection')]
+       ['link' => $this->entity->toUrl('collection')->toString()]
       );
       $this->logger('support_ticket')
         ->notice('Added support ticket type %name.', $context);