# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

from pathlib import Path
from typing import Optional, Union

import pytest
from transformers import PretrainedConfig

from vllm.transformers_utils.config import get_config_parser, register_config_parser
from vllm.transformers_utils.config_parser_base import ConfigParserBase


@register_config_parser("custom_config_parser")
class CustomConfigParser(ConfigParserBase):
    def parse(
        self,
        model: Union[str, Path],
        trust_remote_code: bool,
        revision: Optional[str] = None,
        code_revision: Optional[str] = None,
        **kwargs,
    ) -> tuple[dict, PretrainedConfig]:
        raise NotImplementedError


def test_register_config_parser():
    assert isinstance(get_config_parser("custom_config_parser"), CustomConfigParser)


def test_invalid_config_parser():
    with pytest.raises(ValueError):

        @register_config_parser("invalid_config_parser")
        class InvalidConfigParser:
            pass
