Better Unicode handling in ID generation

[pytestbot]

Originally reported by: BitBucket: thiefmaster, GitHub: thiefmaster

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some::test[foo-bar] is much nicer than some::test[a0-b0]

Any non-ascii characters could be simply skipped or replaced with an underscore (or even transliterated).

I think it would also make perfect sense to replace whitespace with underscores.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/656

[pfctdayelise]

@ThiefMaster

Example test:

@pytest.mark.parametrize('a', ['aa',
                               u'æ'])
def test_bar(a):
    pass

In python3 these will have nice names, in python 2 not.

Re replacing whitespace with underscores, not sure about that as you might have two distinct examples one with whitespace and one with underscores. Picking apart unicode and skipping random chars sounds like a recipe for trouble. On python2 we should either make them have a nice name (matching python3 behaviour) or tell people to specify ids if they want nicer names to be generated.

[nicoddemus]

#1031 probably is a good enough solution here, so I'm closing this for now.