scheduled_publish-8.x-3.9/tests/modules/scheduled_publish_test/scheduled_publish_test.services.yml

services:

  # A subscriber to listen for scheduled_publish ScheduledStateChange events.
  scheduled_publish_test.scheduled_state_change:
    class: Drupal\scheduled_publish_test\EventSubscriber\ScheduledStateChange
    tags:
      - { name: 'event_subscriber' }