def METHOD_NAME(self):
    lti_params = LTIParams(
        {
            "oauth_nonce": "STRIPPED",
            "oauth_timestamp": "STRIPPED",
            "oauth_signature": "STRIPPED",
            "id_token": "STRIPPED",
            "other_values": "REMAIN",
        }
    )
    assert lti_params.serialize(extra="value") == {
        "other_values": "REMAIN",
        "extra": "value",
    }