ansible/test/integration/targets/docker_secret/tasks/main.yml

- include_tasks: test_secrets.yml
  # Maximum of 2.1.0 (docker-py version for docker_secrets) and 2.6.0 (docker-py version for docker_swarm) is 2.6.0
  when: docker_py_version is version('2.6.0', '>=') and docker_api_version is version('1.25', '>=')

- fail: msg="Too old docker / docker-py version to run docker_secrets tests!"
  when: not(docker_py_version is version('2.6.0', '>=') and docker_api_version is version('1.25', '>=')) and (ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6)