pytest /

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The pytest testing tool makes it easy to write small tests, yet scales to support complex functional testing. It provides

  • auto-discovery of test modules and functions,
  • detailed info on failing assert statements (no need to remember self.assert* names)
  • modular fixtures for managing small or parametrized long-lived test resources.
  • multi-paradigm support: you can use pytest to run test suites based on unittest (or trial), nose
  • single-source compatibility from Python2.6 all the way up to Python3.4, PyPy-2.3, (jython-2.5 untested)
  • many external plugins.

A simple example for a test:

# content of
def test_function():
    i = 4
    assert i == 3

which can be run with py.test See getting-started for more examples.

For much more info, including PDF docs, see

and report bugs at:

and checkout or fork repo at:

Copyright Holger Krekel and others, 2004-2014 Licensed under the MIT license.