[router] Add comprehensive E2E tests for Response API (#11988)

sgl-router/py_test/e2e_response_api/conftest.py

@@ -0,0 +1,39 @@
+"""
+pytest configuration for e2e_response_api tests.
+
+This configures pytest to not collect base test classes that are meant to be inherited.
+"""
+
+import pytest
+
+
+def pytest_collection_modifyitems(config, items):
+    """
+    Modify test collection to exclude base test classes.
+
+    Base test classes are meant to be inherited, not run directly.
+    We exclude any test that comes from these base classes:
+    - StateManagementBaseTest
+    - ResponseCRUDBaseTest
+    - ConversationCRUDBaseTest
+    - MCPTests
+    - StateManagementTests
+    """
+    base_class_names = {
+        "StateManagementBaseTest",
+        "ResponseCRUDBaseTest",
+        "ConversationCRUDBaseTest",
+        "MCPTests",
+        "StateManagementTests",
+    }
+
+    # Filter out tests from base classes
+    filtered_items = []
+    for item in items:
+        # Check if the test's parent class is a base class
+        parent_name = item.parent.name if hasattr(item, "parent") else None
+        if parent_name not in base_class_names:
+            filtered_items.append(item)
+
+    # Update items list
+    items[:] = filtered_items