@Test public void shouldReturnFalseIfLeftNodesAreGraterThanRightNodesIterative() {

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