private SimpleGraph<Integer, DefaultEdge> buildGraphForTestDisconnected(int size) {
SimpleGraph<Integer, DefaultEdge> graph = new SimpleGraph<>(DefaultEdge.class);
VertexFactory<Integer> vertexFactory = new IntegerVertexFactory();
CompleteGraphGenerator<Integer, DefaultEdge> completeGraphGenerator =
new CompleteGraphGenerator<>(size);
// two complete graphs
SimpleGraph<Integer, DefaultEdge> east = new SimpleGraph<>(DefaultEdge.class);
completeGraphGenerator.generateGraph(east, vertexFactory, null);
SimpleGraph<Integer, DefaultEdge> west = new SimpleGraph<>(DefaultEdge.class);
completeGraphGenerator.generateGraph(west, vertexFactory, null);
Graphs.addGraph(graph, east);
Graphs.addGraph(graph, west);
// connected by single edge
graph.addEdge(size - 1, size);
return graph;
}
