New issue 759: Allow parametrize ids to accept generators
https://bitbucket.org/pytest-dev/pytest/issue/759/allow-parametrize-ids-to-accept-generators
Ivan Smirnov:
Is it too restrictive to assert that `ids` in `Metafunc.parametrize` must
always have length? It might be more Pythonic to try and create a list of
`len(argvalues)` elements out of `ids` first:
```python
...
idfn = None
if callable(ids):
idfn = ids
ids = None
if ids and len(ids) != len(argvalues):
raise ValueError('%d tests specified with %d ids' %(
len(argvalues), len(ids)))
...
```
An example use case could be something like this (enumerate the parametrized
tests):
```python
@pytest.mark.parametrize('param', ['foo', 'bar', 'baz'], ids=itertools.count())
def some_test(x):
# ...
```
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