diff --git a/tests/test_util.py b/tests/test_util.py
index b68f32c..b58bda6 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -201,5 +201,6 @@ def test_dir_size(self):
             self.assertEqual(util.dir_size(dir1), expected)
             self.assertEqual(util.dir_size(dir1, True), expected + file1.stat().st_size)
 
+
 if __name__ == '__main__':
     unittest.main(exit=False)