[V0 deprecation]clean up is_v1_supported_oracle (#28116)

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

tests/v1/test_oracle.py

@@ -1,55 +1,17 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-import os
-
 import pytest
 
-import vllm.envs as envs
-from vllm import LLM
 from vllm.engine.arg_utils import AsyncEngineArgs
 
 MODEL = "meta-llama/Llama-3.2-1B-Instruct"
 
 
-def test_reject_bad_config(monkeypatch):
-    with monkeypatch.context() as m:
-        m.setenv("VLLM_USE_V1", "0")
-
-
-def test_unsupported_configs(monkeypatch):
-    with monkeypatch.context() as m:
-        m.setenv("VLLM_USE_V1", "1")
-
-        with pytest.raises(NotImplementedError):
-            AsyncEngineArgs(
-                model=MODEL,
-                speculative_config={
-                    "model": MODEL,
-                },
-            ).create_engine_config()
-
-
-def test_enable_by_default_fallback(monkeypatch):
-    with monkeypatch.context() as m:
-        if os.getenv("VLLM_USE_V1", None):
-            m.delenv("VLLM_USE_V1")
-
-        # Should default to V1 for supported config.
-        _ = AsyncEngineArgs(
+def test_unsupported_configs():
+    with pytest.raises(NotImplementedError):
+        AsyncEngineArgs(
             model=MODEL,
-            enforce_eager=True,
+            speculative_config={
+                "model": MODEL,
+            },
         ).create_engine_config()
-        assert envs.VLLM_USE_V1
-        m.delenv("VLLM_USE_V1")
-
-
-def test_v1_llm_by_default(monkeypatch):
-    with monkeypatch.context() as m:
-        if os.getenv("VLLM_USE_V1", None):
-            m.delenv("VLLM_USE_V1")
-
-        # Should default to V1 for supported config.
-        llm = LLM(MODEL, enforce_eager=True, enable_lora=True)
-        print(llm.generate("Hello my name is"))
-        assert hasattr(llm.llm_engine, "engine_core")
-        m.delenv("VLLM_USE_V1")