[smg][ci] migrate chat completions tests to new infrastructure and build wheel once and share via artifact (#16709)

sgl-model-gateway/e2e_test/fixtures/hooks.py

@@ -118,8 +118,21 @@ def pytest_collection_modifyitems(
 
     for item in items:
         # Extract model from marker or use default
-        model_marker = item.get_closest_marker(PARAM_MODEL)
-        model_id = model_marker.args[0] if model_marker and model_marker.args else None
+        # First check the class directly (handles inheritance correctly)
+        model_id = None
+        if hasattr(item, "cls") and item.cls is not None:
+            for marker in (
+                item.cls.pytestmark if hasattr(item.cls, "pytestmark") else []
+            ):
+                if marker.name == PARAM_MODEL and marker.args:
+                    model_id = marker.args[0]
+                    break
+        # Fall back to get_closest_marker for method-level markers
+        if model_id is None:
+            model_marker = item.get_closest_marker(PARAM_MODEL)
+            model_id = (
+                model_marker.args[0] if model_marker and model_marker.args else None
+            )
 
         # Check parametrize for model
         if model_id is None: