addNodes(graph);

    assertThat(graph.nodeOrder()).isEqualTo(ElementOrder.sorted(Ordering.<Integer>natural()));
    assertThat(graph.nodes()).containsExactly(1, 3, 4).inOrder();
  }

  @Test
  public void nodeOrder_sorted() {
    MutableGraph<Integer> graph =
        GraphBuilder.directed()
            .nodeOrder(ElementOrder.sorted(Ordering.<Integer>natural().reverse()))
            .build();

    addNodes(graph);