public void Test_BstFromPreorder()
{
long[] preorder = _algo.Preorder(_testTree);
long[] postorder = _algo.Postorder(_testTree);
Assert.AreEqual(_treeElements.Length, preorder.Length);
Assert.AreEqual(_treeElements.Length, postorder.Length);
long min, max;
Assert.IsTrue(_algo.IsBST(_testTree, out min, out max));
// change root to 7. it is no longer a BST
_testTree.Info = 7;
Assert.IsFalse(_algo.IsBST(_testTree, out min, out max));
}
