diff --git a/force_bdss/core_plugins/dummy/dummy_notification_listener/tests/test_dummy_notification_listener_model.py b/force_bdss/core_plugins/dummy/dummy_notification_listener/tests/test_dummy_notification_listener_model.py
index 5200f611b6df602d291f883f8eb4d64a96d037b0..94f3294334377541e7cd08eb30f31cdd5aa18604 100644
--- a/force_bdss/core_plugins/dummy/dummy_notification_listener/tests/test_dummy_notification_listener_model.py
+++ b/force_bdss/core_plugins/dummy/dummy_notification_listener/tests/test_dummy_notification_listener_model.py
@@ -1,7 +1,5 @@
 import unittest
 
-from envisage.plugin import Plugin
-
 from force_bdss.core_plugins.dummy.dummy_notification_listener\
     .dummy_notification_listener_factory import \
     DummyNotificationListenerFactory
diff --git a/force_bdss/core_plugins/dummy/ui_notification/ui_notification.py b/force_bdss/core_plugins/dummy/ui_notification/ui_notification.py
index 37fb532e271867c6f41777a726eb2b37a49e2fe5..32f776452041aade40ab731fba547c359a166a46 100644
--- a/force_bdss/core_plugins/dummy/ui_notification/ui_notification.py
+++ b/force_bdss/core_plugins/dummy/ui_notification/ui_notification.py
@@ -80,4 +80,3 @@ def _format_event(event):
         return None
 
     return ("EVENT\n{}".format(data)).encode("utf-8")
-
diff --git a/force_bdss/tests/utils.py b/force_bdss/tests/utils.py
index cba62e4cd13bb597f763f98a37060e14935fa753..a91dafd7f9869721562b94bd726cd37e4408e267 100644
--- a/force_bdss/tests/utils.py
+++ b/force_bdss/tests/utils.py
@@ -2,6 +2,7 @@ import sys
 from contextlib import contextmanager
 from six import StringIO
 
+
 @contextmanager
 def captured_output():
     new_out, new_err = StringIO(), StringIO()