ansible/test/integration/roles/test_pip/tasks/main.yml

# test code for the pip 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/>.

# FIXME: replace the python test package

# first some tests installed system-wide
# verify things were not installed to start with

- name: ensure a package is not installed (precondition setup)
  pip: name={{ pip_test_package }} state=absent

# verify that a package that is uninstalled being set to absent
# results in an unchanged state and that the test package is not
# installed

- name: ensure a package is not installed
  pip: name={{ pip_test_package }} state=absent
  register: uninstall_result

- name: removing an unremoved package should return unchanged
  assert: 
    that:
       - "not uninstall_result.changed"

- shell: "python -c 'import {{ pip_test_package }}'"
  register: absent_result
  ignore_errors: True

- name: verify {{ pip_test_package }} is not present
  assert: 
    that:
       - "absent_result.rc != 0"

# now we're going to install the test package knowing it is uninstalled
# and check that installation was ok

- name: ensure a package is installed
  pip: name={{ pip_test_package }} state=present
  register: install_result

- name: verify we recorded a change
  assert:
    that:
      - "install_result.changed == True"
 
- shell: "python -c 'import {{ pip_test_package }}'"
  register: installed_result

# now remove it to test uninstallation of a package we are sure is installed

- name: now uninstall so we can see that a change occurred
  pip: name={{ pip_test_package }} state=absent
  register: absent2  

- name: assert a change occurred on uninstallation
  assert:
    that:
      - "absent2.changed"

# put the test package back

- name: now put it back in case someone wanted it (like us!)
  pip: name={{ pip_test_package }} state=present