diff --git a/epyqlib/tests/test_attrsmodel.py b/epyqlib/tests/test_attrsmodel.py
index 8969beaf..c156a193 100644
--- a/epyqlib/tests/test_attrsmodel.py
+++ b/epyqlib/tests/test_attrsmodel.py
@@ -104,6 +104,7 @@ def merge(name, *types):
     ),
     ((Parameter, "value"),),
     merge("uuid", *types.types.values()),
+    (,(Group, "comment")),
 )
 
 
@@ -128,14 +129,16 @@ def make_a_model(
     )
 
     group_a = group_cls(
-        name="Group A", uuid="f5b7569e-9d7e-4433-a034-29c3e04d1ad4", comment=""
+        name="Group A",
+        uuid="f5b7569e-9d7e-4433-a034-29c3e04d1ad4",
     )
     parameter_a_a = parameter_cls(
         name="Parameter A A",
         uuid="df286eb3-67f0-42d6-b56a-8ee1ded49248",
     )
     group_a_b = group_cls(
-        name="Group A B", uuid="aee15e15-c5df-4e73-ae1a-9a5d4eaa798a", comment=""
+        name="Group A B",
+        uuid="aee15e15-c5df-4e73-ae1a-9a5d4eaa798a",
     )
     parameter_b = parameter_cls(
         name="Parameter B",
@@ -143,7 +146,8 @@ def make_a_model(
         uuid="a1fd7abb-4760-472e-bc94-1ef4d2cfad62",
     )
     group_c = group_cls(
-        name="Group C", uuid="2777e016-a3e6-470d-b20c-7a44904df710", comment=""
+        name="Group C",
+        uuid="2777e016-a3e6-470d-b20c-7a44904df710",
     )
     parameter_d = parameter_cls(
         name="Parameter D",