assertThat(network.hasEdgeConnecting(node, otherNode)).isFalse();
            break;
          case 1:
            E edge = edgesConnecting.iterator().next();
            assertThat(network.edgeConnectingOrNull(node, otherNode)).isEqualTo(edge);
            assertThat(network.edgeConnecting(node, otherNode).get()).isEqualTo(edge);

            break;
          case 1:
            assertThat(network.edgeConnectingOrNull(node, otherNode))
                .isEqualTo(edgesConnecting.iterator().next());
            assertThat(network.hasEdgeConnecting(node, otherNode)).isTrue();
            break;
          default:
            assertThat(network.hasEdgeConnecting(node, otherNode)).isTrue();