cas_mock_server-8.x-1.0/tests/modules/cas_mock_server_test/cas_mock_server_test.services.yml

services:
  cas_mock_server_test.subscriber:
    class: Drupal\cas_mock_server_test\EventSubscriber\CasMockServerTestSubscriber
    arguments: ['@state']
    tags:
      - { name: event_subscriber }