public void DFSBinarySearchTreeInOrderRecursiveTest()
{
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", "2", "3", "4", "5", "6", "7" }, DFS.DFSBinarySearchTreeInOrderRecursive(binarySearchTree.Root));
}