diff --git a/tests/pytest/mock_input.py b/tests/pytest/mock_input.py
index af4b6d8a..d4e49704 100644
--- a/tests/pytest/mock_input.py
+++ b/tests/pytest/mock_input.py
@@ -35,6 +35,7 @@ class mock_signal():
     @staticmethod
     def clear():
         pass
+
 class Mock_TTkInput():
     exceptionRaised = mock_signal
     inputEvent = mock_signal