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

- name: test templated values in handlers
  hosts: localhost
  gather_facts: no
  vars:
    handler1: name1
    handler2: name2
    handler3: name3
    handler4: name4
    handler_list:
      - name5
      - name6

  handlers:
    - name: name1
      set_fact:
        non_templated_name: True
    - name: "{{ handler2 }}"
      set_fact:
        templated_name: True
    - name: testlistener1
      set_fact:
        non_templated_listener: True
      listen: name3
    - name: testlistener2
      set_fact:
        templated_listener: True
      listen: "{{ handler4 }}"
    - name: name5
      set_fact:
        handler5: True
    - set_fact:
        handler6: True
      listen: name6

  tasks:
    - command: echo Hello World
      notify:
        - "{{ handler1 }}"
        - "{{ handler2 }}"
        - "{{ handler3 }}"
        - "{{ handler4 }}"

    - meta: flush_handlers

    - assert:
        that:
          - non_templated_name is defined
          - templated_name is defined
          - non_templated_listener is defined
          - templated_listener is undefined

    - command: echo
      notify: "{{ handler_list }}"

    - meta: flush_handlers

    - assert:
        that:
          - handler5 is defined
          - handler6 is defined

    - include_role: name=test_templating_in_handlers