removed complexity test

IPython/kernel/core/tests/test_notification.py

@@ -169,11 +169,3 b' class NotificationTests(unittest.TestCase):'
         
         o.verify()
     
-    
-    def test_complexity_with_no_observers(self):
-        """Test that the notification center's algorithmic complexity is O(1)
-        with no registered observers (for the given notification type)
-        """
-        
-        self.fail("I'm not sure how to test this.")
-