Mailman 3 July 2015 - pytest-dev

Working with other dependency injection systems
by Kai Groner Sept. 10, 2015

Sept. 10, 2015

Hi testing people! I'm trying to figure out how I can test a code base that uses an existing dependency injection system. I've run into two problems, and I have solutions for each of them but I think maybe there is a better way, so I'm looking for some advice. The first problem is how do I override how a test using this injector is called? I think I want to use the pytest_runtest_call hook, but it still tries to invoke the test without the injector. My current solution is to use the experimental hookwrapper mechanism to replace item.obj with a partially bound version, then restore it afterward. The second problem I'm having is the py.test fixture system is trying to resolve arguments that are provided by this other injector. How can I tell it that some of these don't need to be provided? My current solution is to blind py.test with a wrapper function with a *a, **kw signature. I use functools.wraps, so annotations are introspectable for the other injector, and delete the __wrapped__ attribute to prevent py.test from introspecting it. Is there a nicer, and perhaps less blunt, way to influence the funcarg fixture behaviors? I've tried a couple things with the pytest_collection_modifyitems hook, but haven't gotten anything that works yet. Other details to know about this injection system: - we want to build and teardown the injector with each test - we may want to configure the injector differently for some tests (possibly with fixture data from py.test) Thanks, Kai

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Move Cookiecutter template for Pytest plugins to Org
by Raphael Pierzina July 30, 2015

July 30, 2015

Hi there, Andreas and I have been working on a Cookiecutter template for Pytest plugins during the EuroPython 2015 sprints. I think it is ready to be moved to the pytest-dev organization on github, on condition that there are no objections obviously. The template itself is covered by tests and runs the tests of the generated pytest plugin. https://github.com/hackebrot/cookiecutter-pytest-plugin <https://github.com/hackebrot/cookiecutter-pytest-plugin> Please let me know your thoughts! Best regards from Bilbao, Raphael

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Moving pytest-cov to pytest-dev org on Github
by Marc Schlaich July 29, 2015

July 29, 2015

Hi, as proposed by Anatoly Bubenkov ( https://github.com/schlamar/pytest-cov/issues/48) I want to move pytest-cov to the pytest-dev organisation on GitHub if there are no objections. I'm already listed as maintainer, but please add my core contributor @ionelmc <https://github.com/ionelmc> as well. Regards, Marc <https://github.com/ionelmc>

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What is the best path to walk in building a mental model of the py.test codebase?
by Andrew Farrell July 26, 2015

July 26, 2015

Hi Folks, I'm starting out reading through the py.test codebase in order to: 1) Educate myself on how test frameworks are structured. 2) Experiment with using pieces of the_silver_searcher <https://github.com/ggreer/the_silver_searcher> or reducing the number of missed stat() calls python makes to increase the speed of test discovery. 3) Be able to figure out answers to specific questions I have such as "How do I get specific subsets of tests to run when the -k or -m options don't seem to actually prevent tests from being run?" If it isn't too much trouble, does anyone here suggestions for what the best order to follow when reading the codebase? Any contributors that could retell how they built a clear mental model of it when they started? Thank you, Andrew

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test_pdb.py hangs in PyCharm 4.5
by Omar Kohl July 26, 2015

July 26, 2015

Hi, I tried running the py.test tests in PyCharm and 'test_pdb_collection_failure_is_shown()' from the test_pdb.py module simply hangs and stops execution. Playing around I found this is because PyCharm disables output capturing (probably because they want to capture it themselves). It can be reproduced easily without PyCharm: py.test -s testing/test_pdb.py Then one can type 'c' (continue in pdb) - even though no output is shown regarding pdb - and the test run finishes. Following is the default command executed by PyCharm to run the test: python3 /opt/pycharm-community-4.5.2/helpers/pycharm/pytestrunner.py -p pytest_teamcity testing/test_pdb.py --capture=sys To verify that the problem is as described TWO things need to be done: 1. Remove the --capture=sys from the command (or replace with --capture=fd) 2. Comment out line 25 in pytestrunner.py (args.append("-s") if "-s" not in args else None ) Any suggestion on what can be done to fix this? Can/should I open an issue? In a way it could be seen as a PyCharm problem, but I can see why they would want to prevent output capturing to be able to do this themselves in their console. On the other hand it also happens when running the test on the console having disabled capturing (-s). Is it possible/reasonable to fail or skip the test if it is detected that output is not being captured? (Remember currently it just freezes, which I think is very confusing!). In any case this mail should serve as documentation to anyone having trouble with this issue: Just ignore the test and run it manually outside PyCharm would be my recommendation. Kind regards, Omar

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syntax for importing modules in Pytest tests
by dpb dpb July 24, 2015

July 24, 2015

I'm converting some tests written earlier for Unittest and am having trouble with import statements when running them with Pytest. As an example, in the older code the module create.py in directory lib might be imported as import lib.create > but this syntax usually raises errors when I run the code with Pytest. I'd appreciate any advice. Details and minimal examples below. 1. I am in the directory temp: temp/ lib/ __init__.py create.py tests/ test_caller.py 2. File __init__.py is empty. The other two files are as follows: # test_caller.py > > import lib.create > > def test_show(): > assert True > and # create.py > > def create(): > pass > 3. Running Pytest from within temp typically generates an ImportError: $ py.test tests > ============================= test session starts > ============================== > platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.7.0 > rootdir: .../temp/tests, inifile: > collected 0 items / 1 errors > > ==================================== ERRORS > ==================================== > _______________________ ERROR collecting test_caller.py > ________________________ > tests/test_caller.py:3: in <module> > import lib.create > E ImportError: No module named lib.create > =========================== 1 error in 0.01 seconds > ============================ > 4. I have tried updating the sys.path list in test_caller.py: import sys > sys.path.append('lib') > or sys.path.extend(['..', 'lib']) > but the result is the same. Thanks for any suggestions as to how to deal with this.

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Stickers?
by Brianna Laugher July 24, 2015

July 24, 2015

Hi, So it occurred to me today that we could make pytest stickers! And I could try and get them made this week to distribute to people at Europython, as well as posting some to people who aren't here. Camaloon was recommended to me, http://camaloon.co.uk/custom-stickers it costs about under 80€ for 500 small stickers. I was just thinking the pytest logo & name would be good. I might also check out what local print shops can do but I suspect the quality would not be as good. So are there a few people who would chip in for this in exchange for 50 stickers? :) cheers Brianna -- They've just been waiting in a mountain for the right moment: http://modernthings.org/

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Europython meetup notes
by Brianna Laugher July 22, 2015

July 22, 2015

Hi, Here's the notes I took from the pytest meetup last night. Corrections welcome! https://docs.google.com/document/d/1BUDnjISkYxGiQlIF_adxg92JHL4t5ZwfuiqXEbZ… I also made a Meetings page on the wiki and put a photo from last night, as well as stuff from the FOSDEM meeting. https://github.com/pytest-dev/pytest/wiki/Meetings cheers Brianna -- They've just been waiting in a mountain for the right moment: http://modernthings.org/

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EP2015 Bilbao pytest meetup tuesday 5:30pm?
by holger krekel July 20, 2015

July 20, 2015

Just wanted to convey my travel planning for EP2015: i arrive Monday (20th) afternoon and leave Friday early evening. what about a pytest meetup at 5:30 pm tuesday in an open space session and then heading towards dinner? i won't be staying too late, however, as i have my talk at 9:30 wednesday morning. cheers, holger

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pytest versus robotframework?
by holger krekel July 20, 2015

July 20, 2015

Hi, someone inquired about the main difference between robotframework and pytest. Does anybody have input, thoughts on this? ASFAIK pytest-bdd is probably a good idea to look at when comparing with robotframework, right? holger -- about me: http://holgerkrekel.net/about-me/ contracting: http://merlinux.eu

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