avoid some pytest warnings

tests/test_storage.py

@@ -1,5 +1,4 @@
 import asyncio
-import warnings
 from pathlib import Path
 
 import httpx
@@ -155,8 +154,6 @@ def test_user_and_general_storage_is_persisted(screen: Screen):
 
 def test_rapid_storage(screen: Screen):
     # https://github.com/zauberzeug/nicegui/issues/1099
-    warnings.simplefilter('error')
-
     ui.button('test', on_click=lambda: (
         app.storage.general.update(one=1),
         app.storage.general.update(two=2),

tests/test_timer.py

@@ -1,5 +1,4 @@
 import asyncio
-import warnings
 
 import pytest
 
@@ -80,15 +79,17 @@ def test_setting_visibility(screen: Screen, once: bool):
 
 
 def test_awaiting_coroutine(screen: Screen):
-    warnings.simplefilter('error')
+    user = {'name': 'John Doe'}
 
     async def update_user():
         await asyncio.sleep(0.1)
+        user['name'] = 'Jane Doe'
 
     ui.timer(1, update_user)
 
     screen.open('/')
     screen.wait(1)
+    assert user['name'] == 'Jane Doe'
 
 
 def test_timer_on_deleted_container(screen: Screen):