@Test public void shouldReturnTheSameNodeInTheListIfTheTreeJustContainsOneElementUsingQueue() {

  BinaryNode<Integer> root = new BinaryNode<Integer>(0);
  List<BinaryNode> result = binaryTreeByLevel.getUsingQueue(root);
  List<BinaryNode<Integer>> expectedList = Arrays.asList(root);
  assertEquals(expectedList, result);
}