improvements-2.x-dev/modules/improvements_title/tests/modules/improvements_title_test/improvements_title_test.routing.yml

improvements_title_test.altered_route_title:
  path: /improvements-test/altered-route-title
  defaults:
    _controller: \Drupal\improvements_title_test\Controller\ImprovementsTitleTestController::alteredRouteTitle
    _title: Route title
  requirements:
    _access: 'TRUE'