int selfLoopCount = network.edgesConnecting(node, node).size();
      assertThat(network.incidentEdges(node).size() + selfLoopCount)
          .isEqualTo(network.degree(node));

      if (network.isDirected()) {
        assertThat(network.incidentEdges(node).size() + selfLoopCount)
            .isEqualTo(network.inDegree(node) + network.outDegree(node));