My favorite pytest plugins

What is pytest?

pytest is a mature full-featured Python testing tool that helps you write better programs.

I use pytest on every project because of the ease of use and ability to customize/hook into certain aspects of the testing processes. For example, if I want to hook in before each test and process some images (for some reason)... I can do that!

Another great thing about pytest is how easy it is to install plugins. You pip install the plugin--that's it! No configuration required.

My faves


With xdist you can run your tests in parallel by providing the -n flag.

py.test -n 4 will run 4 tests at a time.

$ py.test -n 4
============================ test session starts ============================
platform darwin -- Python 3.5.0, pytest-2.9.1, py-1.4.31, pluggy-0.3.1
django settings: settings.test (from ini file)
rootdir: /Users/eric/src/, inifile: pytest.ini
plugins: django-2.9.1, pythonpath-0.7, spec-1.0.1, xdist-1.14
gw0 [54] / gw1 [54] / gw2 [54] / gw3 [54]
scheduling tests via LoadScheduling


Changes our test output from this:

Pytest without spec output

To this:

Pytest Spec output

To use this module add the --spec flag when running your test, like so:

py.test --spec


Not as flashy/useful as the others, but a nice tool to simplify adding proper python paths to run your tests.

Add python_paths to your pytest.ini configuration:

python_paths = your/path/apps your/path/libs


This plugin instantly shows failed tests instead of waiting until all tests finish to display the output. Works nicely with spec plugin as well.

To use it just add the --instafail flag when running your tests, like so:

py.test --instafail

Thanks for reading

I know this is kind of a "who cares" blog post, but I'm trying to do at least one blog a month and this one popped into my head so I went for it!

Hope it was worth something to somebody, there's already a great list of plugins here but I didn't see any harm in outlining my faves.

In any case, happy holidays tomorrow everyone! :)

— 19 April 2016
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