public void TestGetInfoCalls()
{
// Construct a tree.
// root
// a
// aa
// ab
// b
// ba
var treeView = new MyItemTreeView();
var a = new MyNode("a");
var aa = new MyNode("aa");
var ab = new MyNode("ab");
var b = new MyNode("b");
var ba = new MyNode("ba");
treeView.Root.Children.Add(a);
a.Children.Add(aa);
a.Children.Add(ab);
treeView.Root.Children.Add(b);
b.Children.Add(ba);
var treeViewModel = new TreeViewModel(treeView);
// Test ShowRoot being false.
treeViewModel.ShowRoot = false;
treeViewModel.CollapseAll();
treeView.NodesQueried.Clear();
treeViewModel.Refresh(treeView.Root); // to call IItemView.GetInfo()
var expandedList = treeViewModel.GetExpandedItems().ToList();
Assert.IsTrue(expandedList.Count == 0);
var rootModelNode = treeViewModel.Root;
Assert.IsFalse(rootModelNode.IsVisible);
Assert.IsFalse(rootModelNode.IsSelected);
//IItemView.GetInfo() should not be called on collapsed nodes.
Assert.IsFalse(treeView.NodesQueried.Contains(aa));
// Expand to first leaf ("aa") with ShowRoot being false.
Node firstLeaf = treeViewModel.ExpandToFirstLeaf();
Assert.IsTrue(firstLeaf.Adaptee == aa);
expandedList = treeViewModel.GetExpandedItems().ToList();
Assert.IsTrue(expandedList.Count == 3); // the leaf node can be "expanded"
Assert.IsTrue(expandedList[0] == treeView.Root);
Assert.IsTrue(expandedList[1] == a);
Assert.IsTrue(expandedList[2] == aa);
treeView.NodesQueried.Clear();
treeViewModel.Refresh(treeView.Root); // to call IItemView.GetInfo()
Assert.IsTrue(treeView.NodesQueried.Contains(aa));
Assert.IsTrue(treeView.NodesQueried.Contains(a));
Assert.IsFalse(treeView.NodesQueried.Contains(ba));
// Test ShowRoot being true.
treeViewModel.ShowRoot = true;
treeViewModel.CollapseAll();
expandedList = treeViewModel.GetExpandedItems().ToList();
Assert.IsTrue(expandedList.Count == 0);
// Expand to first leaf ("aa") with ShowRoot being true.
treeView.NodesQueried.Clear();
firstLeaf = treeViewModel.ExpandToFirstLeaf();
Assert.IsTrue(firstLeaf.Adaptee == aa);
expandedList = treeViewModel.GetExpandedItems().ToList();
Assert.IsTrue(expandedList.Count == 3); // the leaf node can be "expanded"
Assert.IsTrue(expandedList[0] == treeView.Root);
Assert.IsTrue(expandedList[1] == a);
Assert.IsTrue(expandedList[2] == aa);
// Test ExpandAll
treeView.NodesQueried.Clear();
treeViewModel.ExpandAll();
treeViewModel.Refresh(treeView.Root); // to call IItemView.GetInfo()
expandedList = treeViewModel.GetExpandedItems().ToList();
Assert.IsTrue(expandedList.Count == 6);
Assert.IsTrue(treeView.NodesQueried.Count == 6);
Assert.AreEqual(treeView, treeViewModel.Adaptee);
Assert.IsTrue(treeViewModel.ShowRoot);
}
