def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def test_int_range_high(self):
        int_range = inputs.int_range(0, 5)
        assert_raises(ValueError, lambda: int_range(6))