import pytest
import os
from transformers import PreTrainedTokenizerBase

from vllm.transformers_utils.tokenizer import get_tokenizer
from ..utils import models_path_prefix

TOKENIZER_NAMES = [
    os.path.join(models_path_prefix, "facebook/opt-125m"),
    os.path.join(models_path_prefix, "gpt2"),
]


@pytest.mark.parametrize("tokenizer_name", TOKENIZER_NAMES)
def test_tokenizer_revision(tokenizer_name: str):
    # Assume that "main" branch always exists
    # tokenizer = get_tokenizer(tokenizer_name, revision="main")
    tokenizer = get_tokenizer(tokenizer_name)
    assert isinstance(tokenizer, PreTrainedTokenizerBase)

    # Assume that "never" branch always does not exist
    with pytest.raises(OSError, match='not a valid git identifier'):
        get_tokenizer(tokenizer_name, revision="never")