commerce-8.x-2.8/modules/order/tests/modules/commerce_order_test/commerce_order_test.services.yml

services:
  commerce_order_test.test_adjustment_processor:
    class: Drupal\commerce_order_test\TestAdjustmentProcessor
    tags:
      - { name: commerce_order.order_processor, priority: 500, adjustment_type: test_adjustment_type }