def test_type(self):
        rset = event.ResultSet()
        with pytest.raises(NotImplementedError):
            rset.extend([])
        with pytest.raises(NotImplementedError):
            rset.extend(False)
def __init__(self, key, child_proxy):
        try:
            self._key = int(key)
        except ValueError:
            self._key = key
        self._child_proxy = child_proxy