diff --git a/tests/test_trading_api.py b/tests/test_trading_api.py
index fae4ff5..eba05e7 100644
--- a/tests/test_trading_api.py
+++ b/tests/test_trading_api.py
@@ -11,7 +11,8 @@ from fastapi.testclient import TestClient
 
 from app.shared.config import get_settings
 from app.shared.errors import CartOperationError, NotLoggedInError
-from app.trading.main import create_app
+from app.trading import main as trading_main
+from app.trading.container import TradingContainer
 from app.trading.services.auth_session import AuthStatus
 
 TOKEN = get_settings().bearer_token
@@ -68,6 +69,9 @@ class StubAuthSession:
         if not self.logged_in:
             raise NotLoggedInError(site=site, detail="stub")
 
+    async def start(self) -> None:
+        """模拟 lifespan 启动；桩不持有真实客户端。"""
+
     async def close(self) -> None:
         """lifespan 收尾会调用；桩没有真实客户端要关"""
 
@@ -139,18 +143,30 @@ class StubSiteInteractor:
             "detail": "连接正常" if self.browser_alive else "浏览器已掉线",
         }
 
+    async def start(self) -> None:
+        """模拟 lifespan 启动；桩不启动 Playwright。"""
+
     async def close(self) -> None:
         """lifespan 收尾会调用；桩没有真实浏览器要关"""
 
 
 @pytest.fixture
-def client_and_stubs():
-    app = create_app()
+def client_and_stubs(monkeypatch):
+    """在 lifespan 之前注入桩，确保离线 API 测试不启动 Playwright。"""
+    stub = StubAuthSession()
+    stub_site = StubSiteInteractor()
+    settings = get_settings().model_copy(update={"auto_login_on_start": False})
+
+    def build_test_container() -> TradingContainer:
+        return TradingContainer(
+            settings=settings,
+            auth_session=stub,  # type: ignore[arg-type]
+            site=stub_site,
+        )
+
+    monkeypatch.setattr(trading_main, "build_container", build_test_container)
+    app = trading_main.create_app()
     with TestClient(app) as client:
-        stub = StubAuthSession()
-        stub_site = StubSiteInteractor()
-        app.state.container.auth_session = stub
-        app.state.container.site = stub_site
         yield client, stub, stub_site