.. image:: http://docs.pytest.org/en/latest/_static/pytest1.png
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:align: center
:alt: pytest
------
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The ``pytest`` framework makes it easy to write small tests, yet
scales to support complex functional testing for applications and libraries.
An example of a simple test:
.. code-block:: python
# content of test_sample.py
def inc(x):
return x + 1
def test_answer():
assert inc(3) == 5
To execute it::
$ pytest
============================= test session starts =============================
collected 1 items
test_sample.py F
================================== FAILURES ===================================
_________________________________ test_answer _________________________________
def test_answer():
> assert inc(3) == 5
E assert 4 == 5
E + where 4 = inc(3)
test_sample.py:5: AssertionError
========================== 1 failed in 0.04 seconds ===========================
Due to ``pytest``'s detailed assertion introspection, only plain ``assert`` statements are used. See `getting-started <http://docs.pytest.org/en/latest/getting-started.html#our-first-test-run>`_ for more examples.
Features
--------
- Detailed info on failing `assert statements <http://docs.pytest.org/en/latest/assert.html>`_ (no need to remember ``self.assert*`` names);
- `Auto-discovery
<http://docs.pytest.org/en/latest/goodpractices.html#python-test-discovery>`_
of test modules and functions;
- `Modular fixtures <http://docs.pytest.org/en/latest/fixture.html>`_ for
managing small or parametrized long-lived test resources;
- Can run `unittest <http://docs.pytest.org/en/latest/unittest.html>`_ (or trial),
`nose <http://docs.pytest.org/en/latest/nose.html>`_ test suites out of the box;
- Python2.6+, Python3.3+, PyPy-2.3, Jython-2.5 (untested);
- Rich plugin architecture, with over 150+ `external plugins <http://docs.pytest.org/en/latest/plugins.html#installing-external-plugins-searching>`_ and thriving community;
Documentation
-------------
For full documentation, including installation, tutorials and PDF documents, please see http://docs.pytest.org.
Bugs/Requests
-------------
Please use the `GitHub issue tracker <https://github.com/pytest-dev/pytest/issues>`_ to submit bugs or request features.
Changelog
---------
Consult the `Changelog <http://docs.pytest.org/en/latest/changelog.html>`__ page for fixes and enhancements of each version.
License
-------
Copyright Holger Krekel and others, 2004-2017.
Distributed under the terms of the `MIT`_ license, pytest is free and open source software.
.. _`MIT`: https://github.com/pytest-dev/pytest/blob/master/LICENSE
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