[V1] V1 Enablement Oracle (#13726)

Signed-off-by: rshaw@neuralmagic.com <rshaw@neuralmagic.com>
Co-authored-by: rshaw@neuralmagic.com <rshaw@neuralmagic.com>
Co-authored-by: Nicolò Lucchesi <nlucches@redhat.com>
Co-authored-by: Tyler Michael Smith <tyler@neuralmagic.com>
Co-authored-by: Michael Goin <michael@neuralmagic.com>

tests/worker/conftest.py

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: Apache-2.0
+import pytest
+
+
+@pytest.fixture(scope="function", autouse=True)
+def use_v0_only(monkeypatch):
+    """
+    This module tests V0 internals, so set VLLM_USE_V1=0.
+    """
+    monkeypatch.setenv('VLLM_USE_V1', '0')