pytest: simple powerful testing with Python
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:
# 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 for more examples.
Detailed info on failing assert statements (no need to remember self.assert* names)
Auto-discovery of test modules and functions
Modular fixtures for managing small or parametrized long-lived test resources
Python 3.6+ and PyPy3
Rich plugin architecture, with over 850+ external plugins and thriving community
For full documentation, including installation, tutorials and PDF documents, please see https://docs.pytest.org/en/stable/.
Please use the GitHub issue tracker to submit bugs or request features.
Consult the 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.
pytest for enterprise
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, 2004-2020.
Distributed under the terms of the MIT license, pytest is free and open source software.
Release history Release notifications | RSS feed
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.