
.. _`non-python tests`:

Working with non-python tests
====================================================

.. _`yaml plugin`:

A basic example for specifying tests in Yaml files
--------------------------------------------------------------

.. _`pytest-yamlwsgi`: http://bitbucket.org/aafshar/pytest-yamlwsgi/src/tip/pytest_yamlwsgi.py
.. _`PyYAML`: http://pypi.python.org/pypi/PyYAML/

Here is an example ``conftest.py`` (extracted from Ali Afshnars special purpose `pytest-yamlwsgi`_ plugin).   This ``conftest.py`` will  collect ``test*.yml`` files and will execute the yaml-formatted content as custom tests:

.. include:: nonpython/conftest.py
    :literal:

You can create a simple example file:

.. include:: nonpython/test_simple.yml
    :literal:

and if you installed `PyYAML`_ or a compatible YAML-parser you can
now execute the test specification::

    nonpython $ py.test test_simple.yml
    =========================== test session starts ============================
    platform linux2 -- Python 2.7.3 -- pytest-2.5.1
    collected 2 items
    
    test_simple.yml .F
    
    ================================= FAILURES =================================
    ______________________________ usecase: hello ______________________________
    usecase execution failed
       spec failed: 'some': 'other'
       no further details known at this point.
    ==================== 1 failed, 1 passed in 0.03 seconds ====================

You get one dot for the passing ``sub1: sub1`` check and one failure.
Obviously in the above ``conftest.py`` you'll want to implement a more
interesting interpretation of the yaml-values.  You can easily write
your own domain specific testing language this way.

.. note::

    ``repr_failure(excinfo)`` is called for representing test failures.
    If you create custom collection nodes you can return an error
    representation string of your choice.  It
    will be reported as a (red) string.

``reportinfo()`` is used for representing the test location and is also
consulted when reporting in ``verbose`` mode::

    nonpython $ py.test -v
    =========================== test session starts ============================
    platform linux2 -- Python 2.7.3 -- pytest-2.5.1 -- /home/hpk/p/pytest/.tox/regen/bin/python
    collecting ... collected 2 items
    
    test_simple.yml:1: usecase: ok PASSED
    test_simple.yml:1: usecase: hello FAILED
    
    ================================= FAILURES =================================
    ______________________________ usecase: hello ______________________________
    usecase execution failed
       spec failed: 'some': 'other'
       no further details known at this point.
    ==================== 1 failed, 1 passed in 0.03 seconds ====================

While developing your custom test collection and execution it's also
interesting to just look at the collection tree::

    nonpython $ py.test --collect-only
    =========================== test session starts ============================
    platform linux2 -- Python 2.7.3 -- pytest-2.5.1
    collected 2 items
    <YamlFile 'test_simple.yml'>
      <YamlItem 'ok'>
      <YamlItem 'hello'>
    
    =============================  in 0.02 seconds =============================
