'Show we trap this unsupported internal combination of params.'

def test_list_role_assignment_fails_with_userid_and_source_groups(self):

    group = unit.new_group_ref(domain_id=CONF.identity.default_domain_id)
    group = self.identity_api.create_group(group)
    self.assertRaises(exception.UnexpectedError, self.assignment_api.list_role_assignments, effective=True, user_id=self.user_foo['id'], source_from_group_ids=[group['id']])
