ansible/docs/docsite/rst/dev_guide/testing_running_locally.rst
mikedlr fbbffbabde Mdd module unit test docs (#31373)
* new documentation for unit testing - especially module unit testing

* unit test documentation reformatting and further fixes

* unit test documentation - point to online coverage reports & fix bad spaces

* Small copy edits.

* First pass copy edit / rewrite. More info needed.

* testing documentation - clean up structure, especially code coverage - reduce repetition

* module unit test documentation - improved introduction

* testing documentation - more fixes from and inspired by review from dharmabumstead

* testing documentation - fixes from mattclay + some other minor tweaks

* More copy edits.

* testing documentation - further fixes from review

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Testing Ansible
***************
.. contents:: Topics
This document describes how to:
* Run tests locally using ``ansible-test``
* Extend
Requirements
============
There are no special requirements for running ``ansible-test`` on Python 2.7 or later.
The ``argparse`` package is required for Python 2.6.
The requirements for each ``ansible-test`` command are covered later.
Test Environments
=================
Most ``ansible-test`` commands support running in one or more isolated test environments to simplify testing.
Remote
------
The ``--remote`` option runs tests in a cloud hosted environment.
An API key is required to use this feature.
Recommended for integration tests.
See the `list of supported platforms and versions <https://github.com/ansible/ansible/blob/devel/test/runner/completion/remote.txt>`_ for additional details.
Interactive Shell
=================
Use the ``ansible-test shell`` command to get an interactive shell in the same environment used to run tests. Examples:
* ``ansible-test shell --docker`` - Open a shell in the default docker container.
* ``ansible-test shell --tox --python 3.6`` - Open a shell in the Python 3.6 ``tox`` environment.
Code Coverage
=============
Code coverage reports make it easy to identify untested code for which more tests should
be written. Online reports are available but only cover the ``devel`` branch (see
:doc:`testing`). For new code local reports are needed.
Add the ``--coverage`` option to any test command to collect code coverage data. If you
aren't using the ``--tox`` or ``--docker`` options which create an isolated python
environment then you may have to use the ``--requirements`` option to ensure that the
correct version of the coverage module is installed
ansible-test units --coverage apt
ansible-test integration --coverage aws_lambda --tox --requirements
ansible-test coverage html
Reports can be generated in several different formats:
* ``ansible-test coverage report`` - Console report.
* ``ansible-test coverage html`` - HTML report.
* ``ansible-test coverage xml`` - XML report.
To clear data between test runs, use the ``ansible-test coverage erase`` command. For a full list of features see the online help::
ansible-test coverage --help