diff -u b/core/modules/system/tests/modules/router_test_directory/router_test.routing.yml b/core/modules/system/tests/modules/router_test_directory/router_test.routing.yml
--- b/core/modules/system/tests/modules/router_test_directory/router_test.routing.yml
+++ b/core/modules/system/tests/modules/router_test_directory/router_test.routing.yml
@@ -155,7 +155,7 @@
   requirements:
     _access: 'TRUE'
 
-router_test.dierarchy_parent:
+router_test.hierarchy_parent:
   path: '/menu-test/parent'
   defaults:
     _controller: '\Drupal\router_test\TestControllers::test'