Funcargs & other fun with pytest

funcargs & other fun with pytest PyCon AU 2012 Brianna Laugher

pytest – all the good stuff✔ all test styles: unittest, doctest, nose✔ boilerplate-free style – natural asserts✔ support for running tests distributed, boxed✔ generate JUnit-style XML for Jenkins CI✔ informative error reporting✔ extensible plugins, useful builtins✔ skip, xfail, custom markers✔ parametrize, generate tests✔ monkeypatch✔ funcargs!

my background● using pytest seriously for ~18 months at work● really enjoying it!● how it feels to use pytest: →

Graphical Forecast Editor● client/server desktop application used by forecasters to generate the (text & graphical) forecasts● pilot in VIC, funding to roll out nationally, ~5 year project, 20+ new devs/testers● existing codebase of Python and C++ (used operationally in US) ● home-grown test suite and runner (via GUI)

informative error reporting

extensible● e.g. add in unittest assert methods

extensible● e.g. add hook for winpdb

custom markers

parametrize

generate tests● defined once per module● list/generate data to supply to 1+ tests● way more flexible cf. py.test.mark.parametrize

generate generators!

monkeypatch

funcargs!

funcargs – idealised db example

funcargs – trivial django example

funcargs – trivial GAE examples

funcargs – why?● dependency injection, aka inversion of control ● works a treat with TDD ● very natural with mocking ● encourages modular design

funcargs – a real DB example

funcargs – to express prereqs● for when a decorator is not powerful enough

funcargs – to hide monkeypatch :)

generate + funcarg - anypython

pytest – the future

test evolution -v0

test evolution - v1

test evolution - v2

test evolution – v3

test evolution - v4

pytest – all the good stuff✔ all test styles: unittest, doctest, nose✔ boilerplate-free style – natural asserts✔ support for running tests distributed, boxed✔ generate JUnit-style XML for Jenkins CI✔ informative error reporting✔ extensible plugins, useful builtins✔ skip, xfail, custom markers✔ parametrize, generate tests✔ monkeypatch✔ funcargs!

● http://codespeak.net/mailman/listinfo/py-dev● testing-in-python mailing list● Stack Overflow● lead developer Holger Krekel is very responsive

pytest.org

credits, thanks, contactComic panels from comicallyvintage.tumblr.comBureau of Meteorology● In particular, Darius Powell introduced pytest to our projectCode examples: gist.github.com/3386951 brianna@modernthings.org brianna.laugher.id.au / b.laugher@bom.gov.au @pfctdayelise

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Funcargs & other fun with pytest

by Brianna Laugher on Aug 18, 2012

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