[router] add basic ci tests for gpt-oss model support (#12651)

Co-authored-by: Chang Su <chang.s.su@oracle.com>

sgl-router/py_test/e2e_response_api/persistence/test_oracle_store.py

@@ -0,0 +1,49 @@
+"""
+Oracle database storage backend tests for Response API.
+
+Run with:
+    export OPENAI_API_KEY=your_key
+    python3 -m pytest py_test/e2e_response_api/persistence/test_oracle_store.py -v
+    python3 -m unittest e2e_response_api.persistence.test_oracle_store.TestOracleStore
+"""
+
+import os
+import sys
+import unittest
+from pathlib import Path
+
+# Add e2e_response_api directory for imports
+_TEST_DIR = Path(__file__).parent.parent
+sys.path.insert(0, str(_TEST_DIR))
+
+# Import local modules
+from mixins.basic_crud import ConversationCRUDBaseTest, ResponseCRUDBaseTest
+from router_fixtures import popen_launch_openai_xai_router
+from util import kill_process_tree
+
+
+class TestOracleStore(ResponseCRUDBaseTest, ConversationCRUDBaseTest):
+    """End to end tests for Oracle database storage backend."""
+
+    api_key = os.environ.get("OPENAI_API_KEY")
+
+    @classmethod
+    def setUpClass(cls):
+        cls.model = "gpt-5-nano"
+        cls.base_url_port = "http://127.0.0.1:30040"
+
+        cls.cluster = popen_launch_openai_xai_router(
+            backend="openai",
+            base_url=cls.base_url_port,
+            history_backend="oracle",
+        )
+
+        cls.base_url = cls.cluster["base_url"]
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_process_tree(cls.cluster["router"].pid)
+
+
+if __name__ == "__main__":
+    unittest.main()