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Next Open Trainings
- Professional Testing with Python, via Python Academy, February 1st to 3rd, 2022, Leipzig (Germany) and remote.
Also see previous talks and blogposts.
.. module:: pytest
The pytest
framework makes it easy to write small, readable tests, and can
scale to support complex functional testing for applications and libraries.
pytest
requires: Python 3.7+ or PyPy3.
PyPI package name: :pypi:`pytest`
Documentation as PDF: download latest
# 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 ============================
platform linux -- Python 3.x.y, pytest-7.x.y, pluggy-1.x.y
rootdir: /home/sweet/project
collected 1 item
test_sample.py F [100%]
================================= FAILURES =================================
_______________________________ test_answer ________________________________
def test_answer():
> assert inc(3) == 5
E assert 4 == 5
E + where 4 = inc(3)
test_sample.py:6: AssertionError
========================= short test summary info ==========================
FAILED test_sample.py::test_answer - assert 4 == 5
============================ 1 failed in 0.12s =============================
Due to pytest
's detailed assertion introspection, only plain assert
statements are used.
See :ref:`Get started <getstarted>` for a basic introduction to using pytest.
- 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 3.7+ or PyPy 3
- Rich plugin architecture, with over 800+ :ref:`external plugins <plugin-list>` and thriving community
- :ref:`Get started <get-started>` - install pytest and grasp its basics just twenty minutes
- :ref:`How-to guides <how-to>` - step-by-step guides, covering a vast range of use-cases and needs
- :ref:`Reference guides <reference>` - includes the complete pytest API reference, lists of plugins and more
- :ref:`Explanation <explanation>` - background, discussion of key topics, answers to higher-level questions
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.
Open Collective is an online funding platform for open and transparent communities. It provides tools to raise money and share your finances in full transparency.
It is the platform of choice for individuals and companies that want to make one-time or monthly donations directly to the project.
See more details in the pytest collective.
Available as part of the Tidelift Subscription.
The maintainers of pytest and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use.
pytest has never been associated with a security vulnerability, but in any case, to report a security vulnerability please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.
Copyright Holger Krekel and others, 2004.
Distributed under the terms of the MIT license, pytest is free and open source software.