py.test can't xfail tests parametrized with callable objects

[pytestbot]

Originally reported by: sergey chipiga (BitBucket: schipiga, GitHub: schipiga)

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Code example:

import pytest


class A(object): pass

@pytest.mark.parametrize('x', [pytest.mark.xfail(A)])
def test(x):
    assert False

or

import pytest

def b():pass

@pytest.mark.parametrize('x', [pytest.mark.xfail(b)])
def test(x):
    assert False

The result: proba.py::test[x0] FAILED

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/750

[pytestbot]

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

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Hum, not sure how easy it is to allow it cc @pfctdayelise

You could also check yourself in _pytest/python.py's parametrize functions.