Update error message for feed key validation test

Author: tyeth

tests/test_mqtt_client.py

@@ -159,7 +159,7 @@ def test_feed_key_too_long(self):
         long_key = 'a' * 129
         with self.assertRaises(ValueError) as context:
             validate_feed_key(long_key)
-        self.assertIn('less than 128 characters', str(context.exception))
+        self.assertIn('128 characters or less', str(context.exception))
 
     def test_feed_key_invalid_characters(self):
         """Test that feed keys with invalid characters raise TypeError."""
@@ -243,4 +243,4 @@ def test_receive_with_invalid_feed_key(self):
         """Test that receive() raises TypeError with invalid feed key."""
         client = MQTTClient('testuser', 'testkey')
         with self.assertRaises(TypeError):
-            client.receive('test@feed')
+            client.receive('test@feed')