[Bugfix] Fix parameter name in get_tokenizer (#4107)

tests/tokenization/test_tokenizer.py

@@ -0,0 +1,20 @@
+import pytest
+from transformers import PreTrainedTokenizerBase
+
+from vllm.transformers_utils.tokenizer import get_tokenizer
+
+TOKENIZER_NAMES = [
+    "facebook/opt-125m",
+    "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")
+    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")