if (graph.isDirected()) {
        assertThat(graph.degree(node)).isEqualTo(graph.inDegree(node) + graph.outDegree(node));
        assertThat(graph.predecessors(node)).hasSize(graph.inDegree(node));
        assertThat(graph.successors(node)).hasSize(graph.outDegree(node));
      } else {
        int selfLoopCount = graph.adjacentNodes(node).contains(node) ? 1 : 0;