diff --git a/tests/test_export.py b/tests/test_export.py
index 8d17cde4..0f494f79 100644
--- a/tests/test_export.py
+++ b/tests/test_export.py
@@ -8,6 +8,7 @@ import pytest
 def datestr():
     yield "2020-10-20 16:59"
 
+
 def build_card_header(datestr):
     top_left_corner = "┎─╮"
     content = top_left_corner + datestr