Add {envsitedir} substitution.

[pytoxbot]

• Bitbucket: https://bitbucket.org/hpk42/tox/issue/72
• Originally reported by: @g2p
• Originally created at: 2012-11-30T17:06:21.764

It seems tricky to figure out the site-packages dir from outside the virtualenv (distutils.sysconfig is inadequate if the interpreter version changes), but it would make certain hacks to get file-based test runners to cooperate with 2to3 much easier.

[pytoxbot]

Original comment by @g2p

@takafumi It can be useful for import-based discovery, but many tools work more reliably or only with a full path. Some tests also try to access resources from the current directory.

[pytoxbot]

Original comment by @tkf

How about changedir = {envtmpdir}? I usually do this when I use 2to3.

[pytoxbot]

Original comment by @hpk42

I think we deifnitely need recommendations how to deal with 2to3. Not sure i get to it in the next weeks. Using "envsitepackagesdir" is kind of a hack, it should be possible to have things working more easily. Haven't thought in depth about it yet, though.

[pytoxbot]

Original comment by @g2p

Ah, and without 2to3, this snippet also prevents py.test reporting an import file mismatch between the build/ directory (which pytest tried to collect) and the vcs version (which ends up imported).

[pytoxbot]

Original comment by @g2p

auto2to3 -m pytest is another option outside tox, but inside tox it would need some extra flags to only cover vcs files, so it's not very interesting.

[pytoxbot]

Original comment by @g2p

py.test finds the non-2to3 source from the vcs checkout in both cases.
I think it's due to the implicit '' at the start of sys.path.
The other workaround I know, besides this one (haven't tried it as my tests aren't in a separate package), is to change directories (that works well).

[pytoxbot]

Original comment by @hpk42

in which case does the normal "--cov=mypkg" not work? And what happens, if you do do "py.test --cov=mypkg --pyargs mypkg" btw?

[pytoxbot]

Original comment by @g2p

I have this snippet that works reliably in the presence of 2to3 (edit: the multiprocessing thing was a red herring), should I mention it in one of the examples?

command={envbindir}/py.test --cov={envsitepackagesdir}/mypkg {envsitepackagesdir}/mypkg

[pytoxbot]

Original comment by @hpk42

Add {envsitepackagesdir} substitution. Closes #72.

→ <>

[pytoxbot]

Original comment by @g2p

https://bitbucket.org/hpk42/tox/pull-request/30/