community.general/test/integration/targets/handlers/test_handlers.yml

---
- name: run handlers
  hosts: A
  gather_facts: False
  roles:
  - { role: test_handlers_meta, tags: ['scenario1'] }

- name: verify final handler was run
  hosts: A
  gather_facts: False
  tasks:
    - name: verify handler2 ran
      assert:
        that:
            - "not hostvars[inventory_hostname]['handler1_called']"
            - "'handler2_called' in hostvars[inventory_hostname]"
      tags: ['scenario1']

- name: verify listening handlers
  hosts: A
  gather_facts: False
  tasks:
    - name: notify some handlers
      command: echo foo
      notify:
        - notify_listen
  post_tasks:
    - name: assert all defined handlers ran without error
      assert:
        that:
        - "notify_listen_ran_1 is defined"
        - "notify_listen_ran_2 is defined"
  handlers:
    - name: first listening handler has a name
      set_fact:
        notify_listen_ran_1: True
      listen: notify_listen
    # second listening handler does not
    - set_fact:
        notify_listen_ran_2: True
      listen: notify_listen

- name: test handlers
  hosts: testgroup
  gather_facts: False
  roles:
  - { role: test_handlers }