Re: pytest plugins

[Efraim Flashner]

On Sun, Apr 10, 2016 at 06:19:38PM +1000, Ben Woodcroft wrote:
> Hi there,
> 
> I'm running into clashes when using pytest plugins e.g.
> 
> $ ./pre-inst-env guix environment -C --ad-hoc python-pytest-cov
> [..]
> warning: collision encountered: 
> /gnu/store/cfj96msw5ypxcii4z615l03wbjq5hcs9-python-pytest-cov-2.2.0/bin/py.test
> /gnu/store/4hz0mf56b9mm8q97k5iw5xbb909vsz4p-python-pytest-2.7.3/bin/py.test
> warning: arbitrarily choosing 
> /gnu/store/cfj96msw5ypxcii4z615l03wbjq5hcs9-python-pytest-cov-2.2.0/bin/py.test
> [..]
> 
> i.e. the pytest executable is included in `python-pytest' as well
> `python-pytest-cov'.
> 
> I'm not sure what the best thing to do is here, because no environment
> variable is honoured during the py.test startup sequence when looking for
> plugins:
> 
> http://pytest.org/latest/writing_plugins.html#plugin-discovery-order-at-tool-startup
> 
> Do any pythonistas have any ideas on how to get around this?
> 
> Thanks,
> ben
> 

I'll try to take a look at it soon-ish™. My first guess is it has to do
with the propagated inputs of some of the python-test packages.

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