wip: a quick fix to the tests for stack

tests/geometry/stack/test_base_stack_stacking.py

@@ -7,6 +7,11 @@
 class MockObjectToStack:
     def __init__(self, value):
         self.value = value
+        self.material_properties = {}
+
+    @property
+    def material(self):
+        return self.material_properties
 
     @property
     def object(self):
@@ -19,6 +24,9 @@ def create(cls, states):
     def update_states(self, value):
         self.value = value
 
+    def update_material(self, **kwargs):
+        self.material_properties.update(kwargs)
+
 
 class MockStack(BaseStack[MockObjectToStack]):
     DefaultType = MockObjectToStack
@@ -93,6 +101,11 @@ def test_update_wrong_size(update_data):
 class MockObjectToStack2:
     def __init__(self, value1, value2):
         self.value = (value1, value2)
+        self.material_properties = {}
+
+    @property
+    def material(self):
+        return self.material_properties
 
     @property
     def object(self):
@@ -105,6 +118,9 @@ def create(cls, states):
     def update_states(self, value1, value2):
         self.value = (value1, value2)
 
+    def update_material(self, **kwargs):
+        self.material_properties.update(kwargs)
+
 
 class Mock2Stack(BaseStack[MockObjectToStack2]):
     DefaultType = MockObjectToStack2