def METHOD_NAME(self):
    """Does the method convert lists of arrays as expected?"""
    self._set_attributes(self.check_arrlist, [numpy.array([1,2,3]), numpy.array([4,5,6])])
    self.data.listify()
    for attr in self.check_arrlist:
        for a in getattr(self.data, attr):
            assert isinstance(a, list)