inline_entity_form-8.x-1.0-rc8/tests/modules/inline_entity_form_test/inline_entity_form_test.routing.yml

inline_entity_form_test.form:
  path: '/ief-test/{form_mode}/{node}'
  defaults:
    _form: '\Drupal\inline_entity_form_test\IefTestForm'
    _title: 'IEF test'
    form_mode: 'default'
    node: NULL
  requirements:
    # Needs to be accessed by an anonymous user.
    _access: 'TRUE'