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

- hosts: localhost
  gather_facts: false
  tasks:
    - name: test implicit flush_handlers tasks pick up notifications done by handlers themselves
      command: echo
      notify: h2
  handlers:
    - name: h1
      debug:
        msg: h1_ran

    - name: h2
      debug:
        msg: h2_ran
      changed_when: true
      notify: h1

- hosts: localhost
  gather_facts: false
  tasks:
    - name: test implicit flush_handlers tasks pick up notifications done by handlers themselves
      command: echo
      notify: h3
  handlers:
    - name: h3
      debug:
        msg: h3_ran
      changed_when: true
      notify: h4

    - name: h4
      debug:
        msg: h4_ran