test: fix

muffin/pytest.py

@@ -52,10 +52,8 @@ async def app(pytestconfig, request, aiolib):  # noqa: ARG001
     """Load an application, run lifespan events, prepare plugins."""
     if not pytestconfig.app:
         logging.warning(
-            (
-                "Improperly configured. Please set ``muffin_app`` in your pytest config. "
-                "Or use ``--muffin-app`` command option."
-            ),
+            "Improperly configured. Please set ``muffin_app`` in your pytest config. "
+            "Or use ``--muffin-app`` command option.",
         )
         return
 
@@ -83,11 +81,12 @@ async def lifecycle(app: Application):
     ]
 
     # Manage lifespan and prepare plugins
-    async with AsyncExitStack() as stack, manage_lifespan(app):
+    async with AsyncExitStack() as stack:
         for conftest in plugin_conf:
             await stack.enter_async_context(conftest())
 
-        yield app
+        async with manage_lifespan(app):
+            yield app
 
 
 @pytest.fixture()