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.. _features:
pytest: helps you write better programs
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
def inc(x):
return x + 1
def test_answer():
assert inc(3) == 5
To execute it::
$ pytest
=========================== test session starts ============================
platform linux -- Python 3.x.y, pytest-3.x.y, py-1.x.y, pluggy-0.x.y
rootdir: $REGENDOC_TMPDIR, inifile:
collected 1 item F [100%]
================================= FAILURES =================================
_______________________________ test_answer ________________________________
def test_answer():
> assert inc(3) == 5
E assert 4 == 5
E + where 4 = inc(3) AssertionError
========================= 1 failed in 0.12 seconds =========================
Due to ``pytest``'s detailed assertion introspection, only plain ``assert`` statements are used.
See :ref:`Getting Started <getstarted>` for more examples.
- Detailed info on failing :ref:`assert statements <assert>` (no need to remember ``self.assert*`` names);
- :ref:`Auto-discovery <test discovery>` of test modules and functions;
- :ref:`Modular fixtures <fixture>` for managing small or parametrized long-lived test resources;
- Can run :ref:`unittest <unittest>` (including trial) and :ref:`nose <noseintegration>` test suites out of the box;
- Python 2.7, Python 3.4+, PyPy 2.3, Jython 2.5 (untested);
- Rich plugin architecture, with over 315+ `external plugins <>`_ and thriving community;
Please see :ref:`Contents <toc>` for full documentation, including installation, tutorials and PDF documents.
Please use the `GitHub issue tracker <>`_ to submit bugs or request features.
Consult the :ref:`Changelog <changelog>` page for fixes and enhancements of each version.
Copyright Holger Krekel and others, 2004-2017.
Distributed under the terms of the `MIT`_ license, pytest is free and open source software.
.. _`MIT`: