py.test can't multiple parametrize with ids if it parametrizes class with two or more test methods

[pytestbot]

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

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Code example

import pytest

@pytest.mark.parametrize('x', [0], ids=['c'])
@pytest.mark.parametrize('y', [0, 1], ids=['a', 'b'])
class Test(object):

    def test1(self, x, y):
        pass

    def test2(self, x, y):
        pass

stack trace

py.test proba.py --collect-only
============================================================================== test session starts ===============================================================================
platform darwin -- Python 2.7.9 -- py-1.4.26 -- pytest-2.7.0
rootdir: /Users/lira/tmp, inifile: 
collected 0 items / 1 errors 

===================================================================================== ERRORS =====================================================================================
___________________________________________________________________________ ERROR collecting proba.py ____________________________________________________________________________
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/runner.py:149: in __init__
    self.result = func()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/main.py:437: in _memocollect
    return self._memoizedcall('_collected', lambda: list(self.collect()))
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/main.py:314: in _memoizedcall
    res = function()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/main.py:437: in <lambda>
    return self._memoizedcall('_collected', lambda: list(self.collect()))
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:563: in collect
    return super(Instance, self).collect()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:355: in collect
    res = self.makeitem(name, obj)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:367: in makeitem
    collector=self, name=name, obj=obj)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:521: in __call__
    return self._docall(self.methods, kwargs)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:528: in _docall
    firstresult=self.firstresult).execute()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:393: in execute
    return wrapped_call(method(*args), self.execute)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:109: in wrapped_call
    wrap_controller.send(call_outcome)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:245: in pytest_pycollect_makeitem
    res = list(collector._genfunctions(name, obj))
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:384: in _genfunctions
    self.ihook.pytest_generate_tests.callextra(methods, metafunc=metafunc)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:524: in callextra
    return self._docall(self.methods + methods, kwargs)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:528: in _docall
    firstresult=self.firstresult).execute()
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/core.py:394: in execute
    res = method(*args)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:154: in pytest_generate_tests
    metafunc.parametrize(*marker.args, **marker.kwargs)
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/_pytest/python.py:859: in parametrize
    len(argvalues), len(ids)))
E   ValueError: 2 tests specified with 1 ids

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/751