community.general/test/integration/targets/win_hostname/tasks/test.yml

---
- name: fail to set hostname to an invalid name
  win_hostname:
    name: invalid/name
  register: fail_hostname
  failed_when: '"Failed to rename computer to ''invalid/name''" not in fail_hostname.msg'

- name: change the hostname (check)
  win_hostname:
    name: '{{test_win_hostname_name}}'
  register: change_hostname_check
  check_mode: yes

- name: get actual hostname
  win_shell: $env:COMPUTERNAME
  register: change_hostname_actual_check

- name: assert change the hostname (check)
  assert:
    that:
    - change_hostname_check is changed
    - change_hostname_check.old_name|upper != test_win_hostname_name|upper
    - change_hostname_check.reboot_required
    - change_hostname_actual_check.stdout_lines[0]|upper != test_win_hostname_name|upper

- name: change the hostname
  win_hostname:
    name: '{{test_win_hostname_name}}'
  register: change_hostname

- name: reboot after changing the hostname
  win_reboot:

- name: get actual hostname
  win_shell: $env:COMPUTERNAME
  register: change_hostname_actual

- name: assert change the hostname
  assert:
    that:
    - change_hostname is changed
    - change_hostname.old_name|upper == change_hostname_check.old_name|upper
    - change_hostname.reboot_required
    - change_hostname_actual.stdout_lines[0]|upper == test_win_hostname_name|upper

- name: change the hostname (idempotent)
  win_hostname:
    name: '{{test_win_hostname_name}}'
  register: change_hostname_again

- name: assert change the hostname (idempotent)
  assert:
    that:
    - not change_hostname_again is changed
    - change_hostname_again.old_name|upper == test_win_hostname_name|upper
    - not change_hostname_again.reboot_required