Example pytest unit test

test_sunos_get_uptime_facts.py

import time
from ansible.module_utils.facts.hardware import sunos


def test_sunos_get_uptime_facts(mocker):
    kstat_output = '\nunix:0:system_misc:boot_time\t1548249689\n'

    module_mock = mocker.patch('ansible.module_utils.basic.AnsibleModule')
    module = module_mock()
    module.run_command.return_value = (0, kstat_output, '')

    inst = sunos.SunOSHardware(module)

    expected = int(time.time()) - 1548249689
    result = inst.get_uptime_facts()
    assert expected == result['uptime_seconds']

tried this one

mator@windrunner:~/ansible$ cat test/units/module_utils/facts/hardware/test.py
from units.compat import unittest
from units.compat.mock import Mock, patch
from ansible.module_utils.facts.hardware import sunos


import mocker


def test_sunos_get_uptime_facts(mocker):
    kstat_output = b'\nunix:0:system_misc:boot_time    1548249689\n'

    module = mocker.Mock()
    inst = sunos.SunOSHardware(module)
    expected = b''  # whatever you expect

    mocker.patch('inst.module.run_command', result=[0, kstat_output, b''])
    rc, out, err = inst.get_uptime_facts()
    assert expected == out



test_sunos_get_uptime_facts

pytest run output

mator@windrunner:~/ansible$ pytest test/units/module_utils/facts/hardware/test.py 
=============================================================== test session starts ================================================================
platform linux2 -- Python 2.7.16, pytest-3.10.1, py-1.7.0, pluggy-0.8.0
rootdir: /home/mator/ansible, inifile: tox.ini
collected 1 item                                                                                                                                   

test/units/module_utils/facts/hardware/test.py E                                                                                             [100%]

====================================================================== ERRORS ======================================================================
__________________________________________________ ERROR at setup of test_sunos_get_uptime_facts ___________________________________________________
file /home/mator/ansible/test/units/module_utils/facts/hardware/test.py, line 9
  def test_sunos_get_uptime_facts(mocker):
E       fixture 'mocker' not found
>       available fixtures: am, cache, capfd, capfdbinary, caplog, capsys, capsysbinary, doctest_namespace, monkeypatch, pytestconfig, record_property, record_xml_attribute, record_xml_property, recwarn, stdin, tmp_path, tmp_path_factory, tmpdir, tmpdir_factory
>       use 'pytest --fixtures [testpath]' for help on them.

/home/mator/ansible/test/units/module_utils/facts/hardware/test.py:9
==============================

i'm getting

E       fixture 'mocker' not found

with test/units/module_utils/facts/hardware/test_linux_get_cpu_info.py

mator@windrunner:~/ansible$ pytest test/units/module_utils/facts/hardware/test_linux_get_cpu_info.py 
=============================================================== test session starts ================================================================
platform linux2 -- Python 2.7.16, pytest-3.10.1, py-1.7.0, pluggy-0.8.0
rootdir: /home/mator/ansible, inifile: tox.ini
collected 1 item                                                                                                                                   

test/units/module_utils/facts/hardware/test_linux_get_cpu_info.py E                                                                          [100%]

====================================================================== ERRORS ======================================================================
_______________________________________________________ ERROR at setup of test_get_cpu_info ________________________________________________________
file /home/mator/ansible/test/units/module_utils/facts/hardware/test_linux_get_cpu_info.py, line 13
  def test_get_cpu_info(mocker):
E       fixture 'mocker' not found
>       available fixtures: am, cache, capfd, capfdbinary, caplog, capsys, capsysbinary, doctest_namespace, monkeypatch, pytestconfig, record_property, record_xml_attribute, record_xml_property, recwarn, stdin, tmp_path, tmp_path_factory, tmpdir, tmpdir_factory
>       use 'pytest --fixtures [testpath]' for help on them.

/home/mator/ansible/test/units/module_utils/facts/hardware/test_linux_get_cpu_info.py:13
============================================================= 1 error in 0.05 seconds ==============================================================
mator@windrunner:~/ansible$ 

as well

but ansible-test units --tox ... works

PS: installed 'mock' packages

$ dpkg -l | grep mock
ii  python-httmock                   1.3.0-1                             all          Mocking library for python-requests
ii  python-mock                      2.0.0-4                             all          Mocking and Testing Library
ii  python-mocker                    1.0-2                               all          Mocker object mocking framework
ii  python3-httmock                  1.3.0-1                             all          Mocking library for python3-requests
ii  python3-mock                     2.0.0-4                             all          Mocking and Testing Library (Python3 version)
ii  ruby-minitest                    5.11.3-1                            all          Ruby test tools supporting TDD, BDD, mocking, and benchmarking

I updated the example with working code. I'm not sure exactly about the real output since I don't have a system to test on. If you feel it's necessary, we could also add more output examples and iterate through them.