ansible/test/integration/targets/lookup_paths/testplay.yml

- name: test initial state
  hosts: testhost
  connection: local
  gather_facts: false
  pre_tasks:
    - name: remove {{ remove }}
      file: path={{ playbook_dir }}/{{ remove }} state=absent
  roles:
    - showfile
  post_tasks:
    - name: from play
      set_fact: play_result="{{lookup('file', 'testfile')}}"

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

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