ansible/test/integration/targets/delegate_to/test_loop_control.yml

- hosts: localhost
  gather_facts: no
  tasks:
    - name: Test delegate_to with loop_control
      ping:
      delegate_to: "{{ item }}"
      with_items:
        - localhost
      loop_control:
        label: "{{ item }}"
      register: out

    - name: Check if delegated_host was templated properly
      assert:
        that:
          - out.results[0]['_ansible_delegated_vars']['ansible_delegated_host'] == 'localhost'