==================================== ERRORS ====================================
___________________________ ERROR collecting test.py ___________________________
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/hooks.py:289: in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/manager.py:68: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/manager.py:62: in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
/gnu/store/hrpai18igc7k5pkm8lv5a0q4qkjwkynp-python-pytest-4.3.0/lib/python3.7/site-packages/_pytest/python.py:226: in pytest_pycollect_makeitem
    res = list(collector._genfunctions(name, obj))
/gnu/store/hrpai18igc7k5pkm8lv5a0q4qkjwkynp-python-pytest-4.3.0/lib/python3.7/site-packages/_pytest/python.py:403: in _genfunctions
    self.ihook.pytest_generate_tests(metafunc=metafunc)
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/hooks.py:289: in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/manager.py:68: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
/gnu/store/5rk8i4agggzcyyg5k73i0ps3p8llcgh6-python-pluggy-0.9.0/lib/python3.7/site-packages/pluggy/manager.py:62: in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
/gnu/store/hrpai18igc7k5pkm8lv5a0q4qkjwkynp-python-pytest-4.3.0/lib/python3.7/site-packages/_pytest/python.py:133: in pytest_generate_tests
    metafunc.parametrize(*marker.args, **marker.kwargs)
/gnu/store/hrpai18igc7k5pkm8lv5a0q4qkjwkynp-python-pytest-4.3.0/lib/python3.7/site-packages/_pytest/python.py:995: in parametrize
    function_definition=self.definition,
/gnu/store/hrpai18igc7k5pkm8lv5a0q4qkjwkynp-python-pytest-4.3.0/lib/python3.7/site-packages/_pytest/mark/structures.py:114: in _for_parametrize
    if len(param.values) != len(argnames):
E   TypeError: object of type 'MarkDecorator' has no len()
!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 1 error in 0.52 seconds ============================