[Model] Add user-configurable task for models that support both generation and embedding (#9424)

tests/entrypoints/llm/test_init.py

@@ -0,0 +1,22 @@
+import pytest
+
+from vllm import LLM
+
+from ...utils import error_on_warning
+
+MODEL_NAME = "facebook/opt-125m"
+
+
+def test_pos_args_deprecated():
+    with error_on_warning(DeprecationWarning):
+        LLM(model=MODEL_NAME, tokenizer=MODEL_NAME)
+
+    with error_on_warning(DeprecationWarning):
+        LLM(MODEL_NAME, tokenizer=MODEL_NAME)
+
+    with pytest.warns(DeprecationWarning, match="'tokenizer'"):
+        LLM(MODEL_NAME, MODEL_NAME)
+
+    with pytest.warns(DeprecationWarning,
+                      match="'tokenizer', 'tokenizer_mode'"):
+        LLM(MODEL_NAME, MODEL_NAME, "auto")