81 lines
3.1 KiB
ReStructuredText
81 lines
3.1 KiB
ReStructuredText
.. _`noseintegration`:
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How to run tests written for nose
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=======================================
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``pytest`` has basic support for running tests written for nose_.
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.. _nosestyle:
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Usage
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-------------
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After :ref:`installation` type:
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.. code-block:: bash
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python setup.py develop # make sure tests can import our package
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pytest # instead of 'nosetests'
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and you should be able to run your nose style tests and
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make use of pytest's capabilities.
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Supported nose Idioms
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----------------------
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* setup and teardown at module/class/method level
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* SkipTest exceptions and markers
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* setup/teardown decorators
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* ``__test__`` attribute on modules/classes/functions
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* general usage of nose utilities
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Unsupported idioms / known issues
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----------------------------------
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- unittest-style ``setUp, tearDown, setUpClass, tearDownClass``
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are recognized only on ``unittest.TestCase`` classes but not
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on plain classes. ``nose`` supports these methods also on plain
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classes but pytest deliberately does not. As nose and pytest already
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both support ``setup_class, teardown_class, setup_method, teardown_method``
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it doesn't seem useful to duplicate the unittest-API like nose does.
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If you however rather think pytest should support the unittest-spelling on
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plain classes please post `to this issue
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<https://github.com/pytest-dev/pytest/issues/377/>`_.
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- nose imports test modules with the same import path (e.g.
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``tests.test_mode``) but different file system paths
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(e.g. ``tests/test_mode.py`` and ``other/tests/test_mode.py``)
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by extending sys.path/import semantics. pytest does not do that
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but there is discussion in `#268 <https://github.com/pytest-dev/pytest/issues/268>`_ for adding some support. Note that
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`nose2 choose to avoid this sys.path/import hackery <https://nose2.readthedocs.io/en/latest/differences.html#test-discovery-and-loading>`_.
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If you place a conftest.py file in the root directory of your project
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(as determined by pytest) pytest will run tests "nose style" against
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the code below that directory by adding it to your ``sys.path`` instead of
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running against your installed code.
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You may find yourself wanting to do this if you ran ``python setup.py install``
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to set up your project, as opposed to ``python setup.py develop`` or any of
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the package manager equivalents. Installing with develop in a
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virtual environment like tox is recommended over this pattern.
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- nose-style doctests are not collected and executed correctly,
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also doctest fixtures don't work.
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- no nose-configuration is recognized.
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- ``yield``-based methods are unsupported as of pytest 4.1.0. They are
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fundamentally incompatible with pytest because they don't support fixtures
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properly since collection and test execution are separated.
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Migrating from nose to pytest
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------------------------------
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`nose2pytest <https://github.com/pytest-dev/nose2pytest>`_ is a Python script
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and pytest plugin to help convert Nose-based tests into pytest-based tests.
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Specifically, the script transforms nose.tools.assert_* function calls into
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raw assert statements, while preserving format of original arguments
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as much as possible.
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.. _nose: https://nose.readthedocs.io/en/latest/
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