private final ElementOrder<String> edgeOrder;

  public StandardMutableDirectedNetworkTest(
      boolean allowsSelfLoops,
      boolean allowsParallelEdges,
      ElementOrder<Integer> nodeOrder,
      ElementOrder<String> edgeOrder) {
    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override

   *
   * <p>The default value is {@link ElementOrder#insertion() insertion order}.
   */
  public <E1 extends E> NetworkBuilder<N, E1> edgeOrder(ElementOrder<E1> edgeOrder) {
    NetworkBuilder<N, E1> newBuilder = cast();
    newBuilder.edgeOrder = checkNotNull(edgeOrder);
    return newBuilder;
  }

  /** Returns an empty {@link MutableNetwork} with the properties of this {@link NetworkBuilder}. */

  }

  // Edge order tests

  @Test
  public void edgeOrder_none() {
    MutableNetwork<Integer, String> network =
        NetworkBuilder.directed().edgeOrder(unordered()).build();

    assertThat(network.edgeOrder()).isEqualTo(unordered());
    assertThat(network.nodeOrder()).isEqualTo(insertion()); // default
  }

  @Test
  public void edgeOrder_insertion() {
    MutableNetwork<Integer, String> network =

  private final ElementOrder<String> edgeOrder;

  public StandardMutableUndirectedNetworkTest(
      boolean allowsSelfLoops,
      boolean allowsParallelEdges,
      ElementOrder<Integer> nodeOrder,
      ElementOrder<String> edgeOrder) {
    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override

  private final ElementOrder<String> edgeOrder;

  public StandardMutableUndirectedNetworkTest(
      boolean allowsSelfLoops,
      boolean allowsParallelEdges,
      ElementOrder<Integer> nodeOrder,
      ElementOrder<String> edgeOrder) {
    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override

  private final ElementOrder<String> edgeOrder;

  public StandardMutableDirectedNetworkTest(
      boolean allowsSelfLoops,
      boolean allowsParallelEdges,
      ElementOrder<Integer> nodeOrder,
      ElementOrder<String> edgeOrder) {
    this.allowsSelfLoops = allowsSelfLoops;
    this.allowsParallelEdges = allowsParallelEdges;
    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override

  }

  // Edge order tests

  @Test
  public void edgeOrder_none() {
    MutableNetwork<Integer, String> network =
        NetworkBuilder.directed().edgeOrder(unordered()).build();

    assertThat(network.edgeOrder()).isEqualTo(unordered());
    assertThat(network.nodeOrder()).isEqualTo(insertion()); // default
  }

  @Test
  public void edgeOrder_insertion() {
    MutableNetwork<Integer, String> network =

    this.isDirected = builder.directed;
    this.allowsParallelEdges = builder.allowsParallelEdges;
    this.allowsSelfLoops = builder.allowsSelfLoops;
    this.nodeOrder = builder.nodeOrder.cast();
    this.edgeOrder = builder.edgeOrder.cast();
    // Prefer the heavier "MapRetrievalCache" for nodes if lookup is expensive. This optimizes
    // methods that access the same node(s) repeatedly, such as Graphs.removeEdgesConnecting().

    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  Network<Integer, String> createGraph() {
    networkBuilder =
        NetworkBuilder.directed()
            .allowsSelfLoops(allowsSelfLoops)
            .allowsParallelEdges(allowsParallelEdges)
            .nodeOrder(nodeOrder)
            .edgeOrder(edgeOrder)
            .immutable();

    return networkBuilder.build();
  }

    this.nodeOrder = nodeOrder;
    this.edgeOrder = edgeOrder;
  }

  @Override
  Network<Integer, String> createGraph() {
    networkBuilder =
        NetworkBuilder.directed()
            .allowsSelfLoops(allowsSelfLoops)
            .allowsParallelEdges(allowsParallelEdges)
            .nodeOrder(nodeOrder)
            .edgeOrder(edgeOrder)
            .immutable();

    return networkBuilder.build();
  }