diff --git a/stix2/test/test_stix2.py b/stix2/test/test_stix2.py
index 03a887b..164aca9 100644
--- a/stix2/test/test_stix2.py
+++ b/stix2/test/test_stix2.py
@@ -302,6 +302,7 @@ def test_relationship_all_required_fields():
     )
     assert str(relationship) == EXPECTED_RELATIONSHIP
 
+
 def test_relationship_autogenerated_fields(relationship):
     assert relationship.type == 'relationship'
     assert relationship.id == 'relationship--00000000-0000-0000-0000-000000000001'