test: 补充知识处理、检索与 Agent 回归用例

覆盖切块、向量检索、工具调用和历史预算；模型相关用例使用桩。

backend/tests/test_lifespan.py

@@ -0,0 +1,50 @@
+"""
+Copyright 2024-2026 ChatterMate
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from app.core.application import app as api
+from app.main import lifespan
+
+
+@pytest.mark.asyncio
+async def test_lifespan_runs_every_startup_step_once():
+    with (
+        patch("app.main.verify_encryption_key") as verify_key,
+        patch("app.main.verify_secret_configuration") as verify_secrets,
+        patch("app.main.initialize_firebase") as init_firebase,
+        patch("app.main.configure_socketio") as configure_socketio,
+        patch("app.main.initialize_cors_listener") as cors_listener,
+        patch("app.main.run_auto_closer_loop", new=AsyncMock()) as auto_closer,
+    ):
+        async with lifespan(api):
+            task = api.state.auto_closer_task
+        await task
+
+    verify_key.assert_called_once_with()
+    verify_secrets.assert_called_once_with()
+    init_firebase.assert_called_once_with()
+    configure_socketio.assert_called_once()
+    cors_listener.assert_called_once_with()
+    auto_closer.assert_awaited_once_with()
+
+
+def test_startup_work_is_not_left_on_the_dead_on_event_list():
+    # Starlette 1.x dropped on_event; FastAPI keeps a compatibility list that a
+    # custom lifespan never runs, so anything registered there is silently dead.
+    assert not api.router.on_startup