@Test public void shouldReturnTrueIfBinaryTreeIsBSTIterative() {

  BinaryNode<Integer> root = new BinaryNode<Integer>(0);
  BinaryNode<Integer> n1 = new BinaryNode<Integer>(1);
  BinaryNode<Integer> n2 = new BinaryNode<Integer>(2);
  n1.setLeft(root);
  n1.setRight(n2);
  assertTrue(isBST.checkIterative(n1));
}