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Next Open Trainings and Events
- Professional Testing with Python, via Python Academy (3 day in-depth training):
- June 11th to 13th 2024, Remote
- March 4th to 6th 2025, Leipzig, Germany / Remote
- pytest development sprint, June 2024 (date poll)
.. 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 3.8+ or PyPy3.
PyPI package name: :pypi:`pytest`
# content of test_sample.py
def inc(x):
return x + 1
def test_answer():
assert inc(3) == 5To execute it:
$ pytest
=========================== test session starts ============================
platform linux -- Python 3.x.y, pytest-8.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) test suites out of the box
- Python 3.8+ or PyPy 3
- Rich plugin architecture, with over 1300+ :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.
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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.