select2-8.x-1.11/tests/modules/select2_form_test/select2_form_test.routing.yml

select2_form_test.optgroup:
  path: '/select2-optgroup-form'
  defaults:
    _form: '\Drupal\select2_form_test\Form\Select2OptgroupForm'
    _title: 'Select2 optgroup test'
  requirements:
    # Only for tests used.
    _access: 'TRUE'

select2_form_test.ajax:
  path: '/select2-ajax-form'
  defaults:
    _form: '\Drupal\select2_form_test\Form\Select2AjaxForm'
    _title: 'Select2 ajax test'
  requirements:
    # Only for tests used.
    _access: 'TRUE'

select2_form_test.autocomplete:
  path: '/select2-autocomplete-form'
  defaults:
    _form: '\Drupal\select2_form_test\Form\Select2AutocompleteForm'
    _title: 'Select2 autocomplete test'
  requirements:
    # Only for tests used.
    _access: 'TRUE'