Fix tests.

traits/observation/tests/test_observe.py

@@ -711,8 +711,7 @@ async def handler(event):
 
         with self.assertWarns(RuntimeWarning):
             with self.assertRaises(RuntimeError):
-                async with asyncio.timeout(0.1):
-                    dispatch_same(handler, event)
+                dispatch_same(handler, event)
 
         self.assertFalse(event.is_set())
 

traits/tests/test_observe.py

@@ -959,7 +959,7 @@ def setUp(self):
         self.addCleanup(_active_handler_tasks.clear)
 
     async def test_async_dispatch(self):
-        event = Event()
+        event = asyncio.Event()
 
         obj = SimpleAsyncExample(value='initial', event=event)