ansible/test/integration/targets/handlers/test_handlers_including_task.yml

---
- name: Verify handler can include other tasks (#47287)
  hosts: testhost
  tasks:
    - name: include a task from the tasks section
      include_tasks: handlers.yml

    - name: notify a handler
      debug:
        msg: notifying handler
      changed_when: yes
      notify: include a task from the handlers section

  handlers:
    - name: include a task from the handlers section
      include_tasks: handlers.yml