test: verify real kbqa workflow

backend/tests/integration/test_session_api.py

@@ -0,0 +1,38 @@
+from collections.abc import AsyncIterator
+
+from fastapi import FastAPI
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker
+
+from kbqa.api.errors import register_exception_handlers
+from kbqa.api.middleware import RequestIDMiddleware
+from kbqa.chat.routes import router
+from kbqa.database import get_session
+
+
+async def test_session_api_persists_and_deletes(sqlite_engine: AsyncEngine) -> None:
+    factory = async_sessionmaker(sqlite_engine, expire_on_commit=False)
+    app = FastAPI()
+    app.add_middleware(RequestIDMiddleware)
+    register_exception_handlers(app)
+    app.include_router(router, prefix="/api/v1")
+
+    async def session_override() -> AsyncIterator[AsyncSession]:
+        async with factory() as session:
+            yield session
+
+    app.dependency_overrides[get_session] = session_override
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+        created = await client.post("/api/v1/sessions", json={"title": "持久化测试"})
+        assert created.status_code == 201
+        session_id = created.json()["id"]
+
+        listed = await client.get("/api/v1/sessions")
+        assert listed.json()["items"][0]["id"] == session_id
+        messages = await client.get(f"/api/v1/sessions/{session_id}/messages")
+        assert messages.json()["items"] == []
+
+        deleted = await client.delete(f"/api/v1/sessions/{session_id}")
+        assert deleted.status_code == 204
+        missing = await client.get(f"/api/v1/sessions/{session_id}/messages")
+        assert missing.status_code == 404