cas-8.x-1.x-dev/tests/modules/cas_user_interaction_test/cas_user_interaction_test.routing.yml

cas_user_interaction_test.form:
  path: '/cas-user-interaction-test'
  defaults:
    _form: Drupal\cas_user_interaction_test\CasUserInteractionTestForm
    _title: 'We need your agreement'
  requirements:
    # On a real use case, access rules should be carefully enforced.
    _access: 'TRUE'