ansible/test/integration/targets/template/unsafe.yml

- hosts: localhost
  gather_facts: false
  vars:
    nottemplated: this should not be seen
    imunsafe: !unsafe '{{ nottemplated }}'
  tasks:

    - set_fact:
        this_was_unsafe: >
                    {{ imunsafe }}

    - set_fact:
          this_always_safe: '{{ imunsafe }}'

    - name: ensure nothing was templated
      assert:
        that:
        - this_always_safe == imunsafe
        - imunsafe == this_was_unsafe.strip()