public void UpdateHeightTest()
{
BinTree<int> tree = new BinTree<int>(new BinNode<int>(10));
tree.InsertAsLC(tree.Root(), 15);
Assert.IsTrue(tree.Root().LChild.Height == 0, "lchild");
tree.InsertAsLC(tree.Root().LChild, 16);
tree.UpdateHeightAbove(tree.Root().LChild);
Assert.IsTrue(tree.Root().LChild.Height == 1);
}