embed-8.x-1.x-dev/tests/embed_test/embed_test.routing.yml

embed_test.test_access:
  path: '/embed-test/access/{editor}/{embed_button}'
  defaults:
    _controller: '\Drupal\embed_test\Controller\EmbedTestController::testAccess'
  requirements:
    _embed_button_editor_access: 'TRUE'
embed_test_csrf.csrftoken:
  path: '/embed-test/get_csrf_token'
  defaults:
    _controller: '\Drupal\embed_test\Controller\EmbedTestController::getCsrfToken'
  requirements:
    _access: 'TRUE'