New issue 621: Random "object" shows up with multiple parametrization
https://bitbucket.org/hpk42/pytest/issue/621/random-object-shows-up-with-multiple
Alex Gaynor:
If you parametrize a test twice, with one of them being an empty list, you end
up with a random instance of `object` being passed to that fixture. Here is an
example:
```
import pytest
@pytest.mark.parametrize("b", [1])
@pytest.mark.parametrize("a", [])
def test_foo(a, b):
raise ZeroDivisionError(a)
```
(this also shows up with `metafunc.parametrize()`, which is how I originally
discovered it)
If you don't have teh `parametrize("b", [1])`, it correctly skips the test.
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