def METHOD_NAME(self) -> None:
    """Test input with malformed NTLM credentials."""
    urls = {"http": "localhost:8080", "https": "localhost:8080"}
    malformed_ntlm_credentials_dict = {
        "urls": urls,
        "username_ntlm": 1234,
        "password_ntlm": 5678,
    }
    malformed_ntlm_credentials = self._get_client_params(
        proxies=malformed_ntlm_credentials_dict
    )
    # Should raise when trying to do username.split('\\', <int>)
    # in NTLM credentials due to int not facilitating 'split'.
    with self.assertRaises(AttributeError):
        _ = malformed_ntlm_credentials.connection_parameters()