diff --git a/tests/widgets/project/test_models.py b/tests/widgets/project/test_models.py
index 6eacbae..9fdc455 100644
--- a/tests/widgets/project/test_models.py
+++ b/tests/widgets/project/test_models.py
@@ -282,6 +282,7 @@ def test_layer_model_append():
     init_list = RATapi.ClassList()
     init_list._class_handle = RATapi.models.Layer
     model = LayersModel(init_list, parent)
+    model.parent = MagicMock()
 
     model.append_item()
 
@@ -305,6 +306,7 @@ def test_layer_model_set_absorption():
     )
 
     model = LayersModel(init_list, parent)
+    model.parent = MagicMock()
 
     model.set_absorption(True)
     for expected, actual in zip(init_list, model.classlist):