community.general/test/integration/roles/test_check_mode/tasks/main.yml

# test code for the template module
# (c) 2014, Michael DeHaan <michael.dehaan@gmail.com>

# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
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# GNU General Public License for more details.
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- name: fill in a basic template in check mode
  template: src=foo.j2 dest={{output_dir}}/checkmode_foo.templated mode=0644
  register: template_result

- name: check whether file exists
  stat: path={{output_dir}}/checkmode_foo.templated
  register: foo

- name: verify that the file was marked as changed in check mode
  assert: 
    that: 
      - "template_result|changed"
      - "not foo.stat.exists"

- name: Actually create the file, disable check mode
  template: src=foo.j2 dest={{output_dir}}/checkmode_foo.templated2 mode=0644
  check_mode: no
  register: checkmode_disabled

- name: fill in template with new content
  template: src=foo.j2 dest={{output_dir}}/checkmode_foo.templated2 mode=0644
  register: template_result2

- name: verify that the file was not changed
  assert: 
    that: 
      - "checkmode_disabled|changed"
      - "not template_result2|changed"