ansible/test/integration/lookup_paths/testplay.yml

- name: test initial state
  hosts: localhost
  connection: local
  gather_facts: false
  roles:
    - showfile
  tasks:
    - name: from play
      set_fact: play_result="{{lookup('file', 'testfile')}}"

    - name: output output
      debug: msg="play> {{play_out}}, role> {{role_out}}"

    - name: verify that result match expected
      assert:
        that:
            - 'play_result == play_out'
            - 'role_result == role_out'