ansible/test/integration/targets/templating_lookup_args/test.yml

- hosts: testhost
  gather_facts: no
  tasks:
    - name: ensure a lookup expression with an embedded template resolving to a marker-containing list exposes the marker to the lookup
      assert:
        that: lookup('accept_no_markers', [a_dict.a_key, 42])[1] == 42
      vars:
        a_dict:
          a_key: "{{ not_defined }}"

    - name: ensure the above expression also works with an embedded template (deprecated)
      assert:
        that: lookup('accept_no_markers', '{{ [a_dict.a_key, 42] }}')[1] == 42
      vars:
        a_dict:
          a_key: "{{ not_defined }}"

    - name: ensure that lookups accepting no args markers return undefined when passed one
      debug:
        msg: "{{ lookup('accept_no_markers', not_defined) is undefined }}"
      register: result

    - assert:
        that: result.msg is true

    - name: ensure the above expression also works with an embedded template (deprecated)
      debug:
        msg: "{{ lookup('accept_no_markers', '{{ not_defined }}') is undefined }}"
      register: result

    - assert:
        that: result.msg is true

    - name: ensure that lookups accepting args markers see them
      assert:
        that: lookup('accept_args_markers', not_defined) is true

    - name: ensure the above expression also works with an embedded template (deprecated)
      assert:
        that: lookup('accept_args_markers', '{{ not_defined }}') is true