@Test public void shouldFindMinNumberAtPosition() {

  BinaryNode<Integer> root = new BinaryNode<Integer>(8);
  BinaryNode<Integer> n3 = new BinaryNode<Integer>(3);
  BinaryNode<Integer> n10 = new BinaryNode<Integer>(10);
  BinaryNode<Integer> n1 = new BinaryNode<Integer>(1);
  BinaryNode<Integer> n6 = new BinaryNode<Integer>(6);
  BinaryNode<Integer> n14 = new BinaryNode<Integer>(14);
  BinaryNode<Integer> n4 = new BinaryNode<Integer>(4);
  BinaryNode<Integer> n7 = new BinaryNode<Integer>(7);
  BinaryNode<Integer> n13 = new BinaryNode<Integer>(13);
  root.setLeft(n3);
  root.setRight(n10);
  n3.setLeft(n1);
  n3.setRight(n6);
  n6.setLeft(n4);
  n6.setRight(n7);
  n10.setRight(n14);
  n14.setLeft(n13);
  int result = findMinNumberAtPosition.find(root, 3);
  assertEquals(4, result);
}