community.general/tests_new/integration/roles/test_template/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,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

- name: fill in a basic template
  template: src=foo.j2 dest={{output_dir}}/foo.templated mode=0644
  register: template_result

- assert: 
    that: 
        - "'changed' in template_result" 
        - "'dest' in template_result" 
        - "'group' in template_result" 
        - "'gid' in template_result" 
        - "'md5sum' in template_result" 
        - "'owner' in template_result" 
        - "'size' in template_result" 
        - "'src' in template_result" 
        - "'state' in template_result" 
        - "'uid' in template_result" 

- name: verify that the file was marked as changed
  assert: { that: "template_result.changed == true" }

# VERIFY CONTENTS

- name: copy known good into place
  copy: src=foo.txt dest={{output_dir}}/foo.txt

- name: compare templated file to known good
  shell: diff {{output_dir}}/foo.templated {{output_dir}}/foo.txt
  register: diff_result

- name: verify templated file matches known good
  assert:  
    that: 
        - 'diff_result.stdout == ""' 
        - "diff_result.rc == 0" 

# VERIFY MODE

- name: set file mode
  file: path={{output_dir}}/foo.templated mode=0644
  register: file_result

- name: ensure file mode did not change
  assert: { that: "file_result.changed != True" }