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.. _`noseintegration`:
Running tests written for nose
=======================================
.. include:: links.inc
``pytest`` has basic support for running tests written for nose_.
.. _nosestyle:
Usage
-------------
After :ref:`installation` type::
python setup.py develop # make sure tests can import our package
pytest # instead of 'nosetests'
and you should be able to run your nose style tests and
make use of pytest's capabilities.
Supported nose Idioms
----------------------
* setup and teardown at module/class/method level
* SkipTest exceptions and markers
* setup/teardown decorators
* ``yield``-based tests and their setup (considered deprecated as of pytest 3.0)
* ``__test__`` attribute on modules/classes/functions
* general usage of nose utilities
Unsupported idioms / known issues
----------------------------------
- unittest-style ``setUp, tearDown, setUpClass, tearDownClass``
are recognized only on ``unittest.TestCase`` classes but not
on plain classes. ``nose`` supports these methods also on plain
classes but pytest deliberately does not. As nose and pytest already
both support ``setup_class, teardown_class, setup_method, teardown_method``
it doesn't seem useful to duplicate the unittest-API like nose does.
If you however rather think pytest should support the unittest-spelling on
plain classes please post `to this issue
<https://github.com/pytest-dev/pytest/issues/377/>`_.
- nose imports test modules with the same import path (e.g.
``tests.test_mod``) but different file system paths
(e.g. ``tests/test_mode.py`` and ``other/tests/test_mode.py``)
by extending sys.path/import semantics. pytest does not do that
but there is discussion in `#268 <https://github.com/pytest-dev/pytest/issues/268>`_ for adding some support. Note that
`nose2 choose to avoid this sys.path/import hackery <https://nose2.readthedocs.io/en/latest/differences.html#test-discovery-and-loading>`_.
If you place a conftest.py file in the root directory of your project
(as determined by pytest) pytest will run tests "nose style" against
the code below that directory by adding it to your ``sys.path`` instead of
running against your installed code.
You may find yourself wanting to do this if you ran ``python setup.py install``
to set up your project, as opposed to ``python setup.py develop`` or any of
the package manager equivalents. Installing with develop in a
virtual environment like Tox is recommended over this pattern.
- nose-style doctests are not collected and executed correctly,
also doctest fixtures don't work.
- no nose-configuration is recognized.
- ``yield``-based methods don't support ``setup`` properly because
the ``setup`` method is always called in the same class instance.
There are no plans to fix this currently because ``yield``-tests
are deprecated in pytest 3.0, with ``pytest.mark.parametrize``
being the recommended alternative.
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