chore: import upstream snapshot with attribution

tests/models/test_litellm_logging_patch.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+import importlib
+
+import pytest
+
+pytest.importorskip("litellm")
+
+
+def test_litellm_logging_patch_env_var_controls_application(monkeypatch):
+    """Assert the serializer patch only applies when the env var is enabled."""
+    litellm_logging = importlib.import_module("litellm.litellm_core_utils.litellm_logging")
+    litellm_model = importlib.import_module("agents.extensions.models.litellm_model")
+
+    monkeypatch.delenv("OPENAI_AGENTS_ENABLE_LITELLM_SERIALIZER_PATCH", raising=False)
+    litellm_logging = importlib.reload(litellm_logging)
+    importlib.reload(litellm_model)
+
+    assert hasattr(
+        litellm_logging,
+        "_extract_response_obj_and_hidden_params",
+    ), "LiteLLM removed _extract_response_obj_and_hidden_params; revisit warning patch."
+    assert getattr(litellm_logging, "_openai_agents_patched_serializer_warnings", False) is False
+
+    monkeypatch.setenv("OPENAI_AGENTS_ENABLE_LITELLM_SERIALIZER_PATCH", "true")
+    litellm_logging = importlib.reload(litellm_logging)
+    importlib.reload(litellm_model)
+
+    assert getattr(litellm_logging, "_openai_agents_patched_serializer_warnings", False) is True