otherGraph.putEdgeValue(1, 2, "valueB");
    assertThat(graph).isNotEqualTo(otherGraph); // values differ
  }

  @Test
  public void incidentEdges_stableIncidentEdgeOrder_preservesIncidentEdgesOrder_directed() {
    graph = ValueGraphBuilder.directed().incidentEdgeOrder(ElementOrder.stable()).build();
    graph.putEdgeValue(2, 1, "2-1");
    graph.putEdgeValue(2, 3, "2-3");