public void DFSBinarySearchTreePostOrderIterativeTest()
{
var binarySearchTree = new BinarySearchTreeKey();
binarySearchTree.Add("4");
binarySearchTree.Add("2");
binarySearchTree.Add("6");
binarySearchTree.Add("1");
binarySearchTree.Add("3");
binarySearchTree.Add("5");
binarySearchTree.Add("7");
Assert.Equal(new [] { "1", "3", "2", "5", "7", "6", "4" }, DFS.DFSBinarySearchTreePostOrderIterative(binarySearchTree.Root));
}