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

- name: get the ansible-test imposed file descriptor limit
  check_rlimit_and_maxfd:
  register: rlimit_limited_return

- name: get existing file descriptor limit
  check_rlimit_and_maxfd:
  register: rlimit_original_return
  vars:
    ansible_python_module_rlimit_nofile: 0  # ignore limit set by ansible-test

- name: attempt to set a value lower than existing soft limit
  check_rlimit_and_maxfd:
  vars:
    ansible_python_module_rlimit_nofile: '{{ rlimit_original_return.rlimit_nofile[0] - 1 }}'
  register: rlimit_below_soft_return

- name: attempt to set a value higher than existing soft limit
  check_rlimit_and_maxfd:
  vars:
    ansible_python_module_rlimit_nofile: '{{ rlimit_original_return.rlimit_nofile[0] + 1 }}'
  register: rlimit_above_soft_return

- name: attempt to set a value lower than existing hard limit
  check_rlimit_and_maxfd:
  vars:
    ansible_python_module_rlimit_nofile: '{{ rlimit_original_return.rlimit_nofile[1] - 1 }}'
  register: rlimit_below_hard_return

- name: attempt to set a value higher than existing hard limit
  check_rlimit_and_maxfd:
  vars:
    ansible_python_module_rlimit_nofile: '{{ rlimit_original_return.rlimit_nofile[1] + 1 }}'
  register: rlimit_above_hard_return

- name: run a role module which uses a role module_util using relative imports
  custom_module:
  register: custom_module_return

- assert:
    that:
      # make sure ansible-test was able to set the limit unless it exceeds the hard limit or the value is lower on macOS
      - rlimit_limited_return.rlimit_nofile[0] == 1024 or rlimit_original_return.rlimit_nofile[1] < 1024 or (rlimit_limited_return.rlimit_nofile[0] < 1024 and ansible_distribution == 'MacOSX')
      # make sure that maxfd matches the soft limit on Python 2.x (-1 on Python 3.x)
      - rlimit_limited_return.maxfd == rlimit_limited_return.rlimit_nofile[0] or rlimit_limited_return.maxfd == -1

      # we should always be able to set the limit lower than the existing soft limit
      - rlimit_below_soft_return.rlimit_nofile[0] == rlimit_original_return.rlimit_nofile[0] - 1
      # the hard limit should not have changed
      - rlimit_below_soft_return.rlimit_nofile[1] == rlimit_original_return.rlimit_nofile[1]
      # lowering the limit should also lower the max file descriptors reported by Python 2.x (-1 on Python 3.x)
      - rlimit_below_soft_return.maxfd == rlimit_original_return.rlimit_nofile[0] - 1 or rlimit_below_soft_return.maxfd == -1

      # we should be able to set the limit higher than the existing soft limit if it does not exceed the hard limit (except on macOS)
      - rlimit_above_soft_return.rlimit_nofile[0] == rlimit_original_return.rlimit_nofile[0] + 1 or rlimit_original_return.rlimit_nofile[0] == rlimit_original_return.rlimit_nofile[1] or ansible_distribution == 'MacOSX'

      # we should be able to set the limit lower than the existing hard limit (except on macOS)
      - rlimit_below_hard_return.rlimit_nofile[0] == rlimit_original_return.rlimit_nofile[1] - 1 or ansible_distribution == 'MacOSX'

      # setting the limit higher than the existing hard limit should use the hard limit (except on macOS)
      - rlimit_above_hard_return.rlimit_nofile[0] == rlimit_original_return.rlimit_nofile[1] or ansible_distribution == 'MacOSX'

      # custom module returned the correct answer
      - custom_module_return.answer == 42