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..
   include-starts-here

==============================
What is Pytest Shell Utilities
==============================

   "When in doubt, shell out"

   -- Thomas S. Hatch


This pytest plugin was extracted from `pytest-salt-factories`_.
If provides a basic fixture ``shell`` which basically uses ``subprocess.Popen``
to run commands against the running system on a shell while providing a nice
assert'able return class.

.. _pytest-salt-factories: https://github.com/saltstack/pytest-salt-factories


Install
=======

Installing ``pytest-shell-utilities`` is as simple as:

.. code-block:: bash

   python -m pip install pytest-shell-utilities


And, that's honestly it.


Usage
=====

Once installed, you can now use the ``shell`` fixture to run some commands and assert against the
outcome.

.. code-block:: python

   def test_assert_good_exitcode(shell):

       ret = shell.run("exit", "0")
       assert ret.returncode == 0


   def test_assert_bad_exitcode(shell):

       ret = shell.run("exit", "1")
       assert ret.returncode == 1



If the command outputs parseable JSON, the ``shell`` fixture can attempt loading that output as
JSON which allows for asserting against the JSON loaded object.


.. code-block:: python

   def test_against_json_output(shell):
       d = {"a": "a", "b": "b"}
       ret = shell.run("echo", json.dumps(d))
       assert ret.data == d


Additionally, the return object's ``.stdout`` and ``.stderr`` can be line matched using
`pytest.pytester.LineMatcher`_:

.. code-block:: python

   MARY_HAD_A_LITTLE_LAMB = """\
   Mary had a little lamb,
   Its fleece was white as snow;
   And everywhere that Mary went
   The lamb was sure to go.
   """


   def test_matcher_attribute(shell):
       ret = shell.run("echo", MARY_HAD_A_LITTLE_LAMB)
       ret.stdout.matcher.fnmatch_lines_random(
           [
               "*had a little*",
               "Its fleece was white*",
               "*Mary went",
               "The lamb was sure to go.",
           ]
       )


.. _pytest.pytester.LineMatcher: https://docs.pytest.org/en/stable/reference.html#pytest.pytester.LineMatcher

..
   include-ends-here

Documentation
=============

The full documentation can be seen `here <https://pytest-shell-utilities.readthedocs.io>`_.
