public void LoadRecursiveLoadsCompleateSubtree()
        {
            var treeView = new TestTreeView();
            var treeLoader = new FavoriteTreeListLoader(treeView, this.Persistence);
            treeLoader.LoadRootNodes(); // now we have 7 including Dummy nodes
            var rootNodes = new TreeListNodes(treeView.Nodes);

            treeLoader.LoadGroupNodesRecursive(rootNodes);
            int allLoadedCount = treeView.GetNodeCount(true);
            // or assert: treeView.Nodes[1].Nodes[0].Nodes[0].Name = "FavoriteA"
            // Dummy are replaced, and also Favorite nodes are included
            Assert.AreEqual(8, allLoadedCount, "Loading recursive subtree should load all nodes without expanding them");

            treeView.Dispose();
        }