minor updates

tests/controls/test_treeview.py

@@ -570,8 +570,8 @@ class TestTreeviewBehaviour:
     assert first_id == second_id
     assert tree_view._state.items[first_id].label == "folder2"
   
-  def test_i_can_add_the_same_node_id_twice(self, root_instance):
-    """Test that adding a node with the same ID as an existing node raises ValueError."""
+  def test_adding_node_with_duplicate_id_replaces_existing(self, root_instance):
+    """Test that adding a node with duplicate ID replaces the existing node."""
     tree_view = TreeView(root_instance)
     
     node1 = TreeNode(label="Node", type="folder", id="existing_id")
@@ -580,43 +580,47 @@ class TestTreeviewBehaviour:
     node2 = TreeNode(label="Other Node", type="folder", id="existing_id")
     tree_view.add_node(node2)
     
-    assert len(tree_view._state.items) == 1, "Node should not have been added to items"
-    assert tree_view._state.items[node1.id] == node2, "Node should not have been replaced"
-
+    # Only one node should exist
+    assert len(tree_view._state.items) == 1, "Should have only one node with this ID"
+    
+    # The second node should have replaced the first
+    assert tree_view._state.items["existing_id"] == node2, "Second node should replace the first"
+    assert tree_view._state.items["existing_id"].label == "Other Node", "Replacement node should have new label"
+  
   def test_selecting_node_cancels_edit_mode(self, root_instance):
     """Test that selecting a node cancels any active edit mode."""
     tree_view = TreeView(root_instance)
     node1 = TreeNode(label="Node 1", type="folder")
     node2 = TreeNode(label="Node 2", type="folder")
-
+    
     tree_view.add_node(node1)
     tree_view.add_node(node2)
-
+    
     # Start editing node1
     tree_view._start_rename(node1.id)
     assert tree_view._state.editing == node1.id
-
+    
     # Select node2
     tree_view._select_node(node2.id)
-
+    
     # Edit mode should be cancelled
     assert tree_view._state.editing is None
     assert tree_view._state.selected == node2.id
-
+  
   def test_selecting_same_editing_node_cancels_edit_mode(self, root_instance):
     """Test that selecting the same node being edited cancels edit mode."""
     tree_view = TreeView(root_instance)
     node = TreeNode(label="Node", type="folder")
-
+    
     tree_view.add_node(node)
-
+    
     # Start editing the node
     tree_view._start_rename(node.id)
     assert tree_view._state.editing == node.id
-
+    
     # Select the same node
     tree_view._select_node(node.id)
-
+    
     # Edit mode should be cancelled
     assert tree_view._state.editing is None
     assert tree_view._state.selected == node.id