diff --git a/tests/plugins/test_sys.py b/tests/plugins/test_sys.py
index 9096825..30e4f95 100644
--- a/tests/plugins/test_sys.py
+++ b/tests/plugins/test_sys.py
@@ -9,7 +9,6 @@ from amqtt.broker import Broker
 from amqtt.client import MQTTClient
 from amqtt.mqtt.constants import QOS_0
 
-
 logger = logging.getLogger(__name__)
 
 # test broker sys