ansible/test/integration/targets/lookups/template_lookup_vaulted.yml

# https://github.com/ansible/ansible/issues/34209
- hosts: localhost
  gather_facts: no
  vars:
      hello_world: Hello World
  tasks:
    - name: Test that template lookup can handle vaulted templates
      set_fact:
        vaulted_hello_world: "{{ lookup('template', 'vaulted_hello.j2') }}"

    - assert:
        that:
          - "vaulted_hello_world|trim == 'Unvaulted Hello World!'"