[py-dev] [hpk42/pytest] Issue with numpy arrays and pytest.mark.parametrize (issue #213)

[astrofrog]

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New issue 213: Issue with numpy arrays and pytest.mark.parametrize
https://bitbucket.org/hpk42/pytest/issue/213/issue-with-numpy-arrays-and

astrofrog:

The following tests used to pass:

```
import pytest
import numpy as np

@pytest.mark.parametrize(('error'), [1., 'spam', np.ones((5, 5))])
def test(error):
    pass
```

but in the latest tip (5de7185c2891) I get the following exception:

```
_________________________________________________ ERROR collecting astropy/nddata/tests/test_nddata.py _________________________________________________
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/runner.py:121: in __init__
>               self.result = func()
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/main.py:366: in _memocollect
>       return self._memoizedcall('_collected', lambda: list(self.collect()))
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/main.py:287: in _memoizedcall
>           res = function()
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/main.py:366: in <lambda>
>   return self._memoizedcall('_collected', lambda: list(self.collect()))
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:348: in collect
>       return super(Module, self).collect()
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:281: in collect
>                   res = self.makeitem(name, obj)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:293: in makeitem
>           collector=self, name=name, obj=obj)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/main.py:157: in call_matching_hooks
>       return hookmethod.pcall(plugins, **kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:426: in pcall
>       return self._docall(methods, kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:433: in _docall
>           res = mc.execute()
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:351: in execute
>           res = method(**kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:185: in pytest_pycollect_makeitem
>               return list(collector._genfunctions(name, obj))
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:309: in _genfunctions
>       gentesthook.pcall(plugins, metafunc=metafunc)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:426: in pcall
>       return self._docall(methods, kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:433: in _docall
>           res = mc.execute()
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/core.py:351: in execute
>           res = method(**kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:105: in pytest_generate_tests
>           metafunc.parametrize(*marker.args, **marker.kwargs)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:687: in parametrize
>                                    scopenum)
/Users/tom/Library/Python/2.7/lib/python/site-packages/pytest-2.3.2-py2.7.egg/_pytest/python.py:601: in setmulti
>           if val == _notexists:
E           ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
```


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