switch (edgesConnecting.size()) {
          case 0:
            assertThat(network.edgeConnectingOrNull(node, otherNode)).isNull();
            assertThat(network.edgeConnecting(node, otherNode).isPresent()).isFalse();
            assertThat(network.hasEdgeConnecting(node, otherNode)).isFalse();
            break;
          case 1:
            E edge = edgesConnecting.iterator().next();