commerce-8.x-2.8/tests/modules/commerce_test/commerce_test.services.yml

services:
  commerce_test.test_availability_checker:
    class: Drupal\commerce_test\TestAvailabilityChecker
    tags:
      - { name: commerce.availability_checker }

  commerce_test.referenceable_plugin_types_subscriber:
    class: \Drupal\commerce_test\EventSubscriber\ReferenceablePluginTypesSubscriber
    tags:
      - { name: event_subscriber }