Add a directory whitelist option

[pytestbot]

Originally reported by: BitBucket: thiefmaster, GitHub: thiefmaster

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Right now you can only blacklist directories using norecursedirs. However, especially in larger projects, it might be much nicer to simply whitelist the folders where you know that there are or might be tests.

Another advantage of this would be avoiding collisions with people creating virtualenvs e.g. in projectfolder/env (personally I always add env* to norecursedirs, but what if someone uses a different folder for his environment?).

Actually, it might make sense if pytest detected virtualenv folders and automatically skipped them...

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/694

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

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I agree that whitelisting would make sense, i've often wished myself it was there -- it probably needs to be overridable when files are specified directly via the command line, though.

[pytestbot]

Original comment by BitBucket: thiefmaster, GitHub: thiefmaster:

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I agree. Specifying a folder or file manually should always override the
whitelist.