diff --git a/gufe/tests/test_custom_json.py b/gufe/tests/test_custom_json.py
index d36bf0ad..093f2ed4 100644
--- a/gufe/tests/test_custom_json.py
+++ b/gufe/tests/test_custom_json.py
@@ -301,6 +301,7 @@ def setup_method(self):
             }
         ]
 
+
 class TestUUIDCodec(CustomJSONCodingTest):
     def setup_method(self):
         self.codec = UUID_CODEC
@@ -314,4 +315,4 @@ def setup_method(self):
                 "__module__": "uuid",
                 "uuid": f"{str(self.objs[0])}",
             }
-        ]
\ No newline at end of file
+        ]