diff --git a/tests/test_slots.py b/tests/test_slots.py
index 2b06ed2ed..67b6cc4b2 100644
--- a/tests/test_slots.py
+++ b/tests/test_slots.py
@@ -8,6 +8,7 @@
 import sys
 import types
 import weakref
+
 from unittest import mock
 
 import pytest
@@ -745,6 +746,7 @@ def f(self):
     assert B(11).f == 121
     assert B(17).f == 289
 
+
 @attr.s(slots=True)
 class A:
     x = attr.ib()