py.test 2 under Python 3 throws error

[wolever]

$ tox -e py37-pytest2
GLOB sdist-make: /Users/wolever/code/parameterized/setup.py
py37-pytest2 inst-nodeps: /Users/wolever/code/parameterized/.tox/dist/parameterized-0.7.0.zip
py37-pytest2 installed: mock==2.0.0,nose==1.3.7,parameterized==0.7.0,pbr==5.1.3,py==1.8.0,pytest==2.9.2,six==1.12.0
py37-pytest2 run-test-pre: PYTHONHASHSEED='2473274294'
py37-pytest2 runtests: commands[0] | py.test parameterized/test.py
======================================================================== test session starts =========================================================================
platform darwin -- Python 3.7.2, pytest-2.9.2, py-1.8.0, pluggy-0.3.1
rootdir: /Users/wolever/code/parameterized, inifile:
collected 0 items / 1 errors

=============================================================================== ERRORS ===============================================================================
_______________________________________________________________ ERROR collecting parameterized/test.py _______________________________________________________________
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/runner.py:150: in __init__
    self.result = func()
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/main.py:435: in _memocollect
    return self._memoizedcall('_collected', lambda: list(self.collect()))
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/main.py:315: in _memoizedcall
    res = function()
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/main.py:435: in <lambda>
    return self._memoizedcall('_collected', lambda: list(self.collect()))
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/python.py:605: in collect
    return super(Module, self).collect()
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/python.py:459: in collect
    res = self.makeitem(name, obj)
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/python.py:471: in makeitem
    collector=self, name=name, obj=obj)
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/vendored_packages/pluggy.py:724: in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/vendored_packages/pluggy.py:338: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/vendored_packages/pluggy.py:333: in <lambda>
    _MultiCall(methods, kwargs, hook.spec_opts).execute()
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/vendored_packages/pluggy.py:595: in execute
    return _wrapped_call(hook_impl.function(*args), self.execute)
.tox/py37-pytest2/lib/python3.7/site-packages/_pytest/vendored_packages/pluggy.py:249: in _wrapped_call
    wrap_controller.send(call_outcome)
E   RuntimeError: generator raised StopIteration
====================================================================== 1 error in 0.41 seconds =======================================================================
ERROR: InvocationError for command '/Users/wolever/code/parameterized/.tox/py37-pytest2/bin/py.test parameterized/test.py' (exited with code 1)
______________________________________________________________________________ summary _______________________________________________________________________________
ERROR:   py37-pytest2: commands failed