ansible/test/integration/targets/module_defaults/test_templated_defaults.yml

- hosts: localhost
  gather_facts: no
  tasks:
    - name: ensure that individual module defaults expand correctly from a template
      module_defaults:
        ansible.builtin.ping: "{{ ping_defaults }}"
      vars:
        ping_defaults:
          data: individual
      ansible.builtin.ping:
      register: individual_result

    - name: ensure that group module defaults expand correctly from a template
      module_defaults:
        group/testgroup: "{{ testgroup_defaults }}"
      vars:
        testgroup_defaults:
          data: group
      ansible.builtin.ping:
      register: group_result

    - assert:
        that:
          - individual_result.ping == "individual"
          - group_result.ping == "group"