public void IsValidBST()
{
var bstree = new Node(10);
bstree.Insert(15);
bstree.Insert(5);
bstree.Insert(4);
bstree.Insert(9);
var result = IsThisABST.IsBST(bstree);
Assert.AreEqual(true, result);
}
public void IsNotValidBST()
{
var bstree = new Node(10);
bstree.Insert(15);
bstree.Insert(5);
bstree.Insert(4);
bstree.Insert(9);
// no longer a BST
bstree.left.right.data = 2;
var result = IsThisABST.IsBST(bstree);
Assert.AreEqual(false, result);
}