Traverser.forTree(fixedSuccessors(Iterables.cycle(1, 2, 3))).breadthFirst(0);
    assertThat(Iterables.limit(result, 8)).containsExactly(0, 1, 2, 3, 1, 2, 3, 1).inOrder();
  }

  @Test
  public void forTree_breadthFirst_tree() throws Exception {
    Traverser<Character> traverser = Traverser.forTree(TREE);

    assertEqualCharNodes(traverser.breadthFirst('h'), "hdegabcf");
    assertEqualCharNodes(traverser.breadthFirst('d'), "dabc");