Jgrapht: NaiveLcaFinderのバグ

みなさん、こんにちは。ドットファイルを解析しようとしているときに、すべてのLCAがRobertとCerseiであるはずのグラフを使用しましたが、代わりに何も受け取りませんでした。 本当にバグか確認してください。 このバグは、NaiveLcaFinderの関数findLcasにあります。

<strong i="9">@Test</strong>
    public void testPseudoLcas(){
     public final String NL = "\n";
        String input = "digraph GOT {"+NL+
            "graph [ bgcolor = whitesmoke ]"+NL+
            "subgraph cluster_stark {"+NL+
                "style = filled ;"+NL+
                "color = lightblue ;"+NL+
                "label = \" House Stark \" ;"+NL+
                "node [ style = filled , color = white ];"+NL+
                "Rickard ;"+NL+
                "Brandon ; Eddard ; Benjen ; Lyanna ;"+NL+
                "Robb ; Sansa ; Arya ; Brandon ; Rickon ;"+NL+
                "node [ shape = doublecircle , style = filled , color = white ];"+NL+
                "Jon ;"+NL+
                "Rickard -> Brandon ;"+NL+
                "Rickard -> Eddard ;"+NL+
                "Rickard -> Benjen ;"+NL+
                "Rickard -> Lyanna ;"+NL+
                "Eddard -> Robb ;"+NL+
                "Eddard -> Sansa ;"+NL+
                "Eddard -> Arya ;"+NL+
                "Eddard -> Brandon ;"+NL+
                "Eddard -> Rickon ;"+NL+
                "Eddard -> Jon [ label = \" bastard \" , color = azure4 ];"+NL+
            "}"+NL+
            "subgraph cluster_baratheon {"+NL+
                "style = filled ;" +NL+
                "color = chocolate3 ;" +NL+
                "label = \" House Baratheon \" ;" +NL+
                "node [ style = filled , color = white ];" +NL+
                "Ormund ; Steffon ; Robert ; Stannis ; Renly ; Shireen ; Joffrey ; Myrcellar ; Tommen ;" +NL+
                "Ormund -> Steffon ;" +NL+
                "Rhaelle -> Steffon ;" +NL+
                "Ormund -> Rhaelle ;" +NL+
                "Rhaelle -> Ormund ;" +NL+
                "Steffon -> Robert ;" +NL+
                "Steffon -> Stannis ;" +NL+
                "Steffon -> Renly ;" +NL+
                "Stannis -> Shireen ;" +NL+
                "Robert -> Joffrey ;" +NL+
                "Robert -> Myrcellar ;" +NL+
                "Robert -> Tommen ;" +NL+
            "}" +NL+
            "subgraph cluster_lannister {"+NL+
                "style = filled ;"+NL+
                "color = cornsilk3 ;"+NL+
                "label = \" House Lannister \" ;"+NL+
                "node [ style = filled , color = white ];"+NL+
                "Tywin ; Joanna ; Jaime ; Cersei ; Tyrion ;"+NL+
                "Tywin -> Joanna ;"+NL+
                "Joanna -> Tywin ;"+NL+
                "Joanna -> Jaime ;"+NL+
                "Joanna -> Cersei ;"+NL+
                "Joanna -> Tyrion ;"+NL+
                "Tywin -> Jaime ;"+NL+
                "Tywin -> Cersei ;"+NL+
                "Tywin -> Tyrion ;"+NL+
                "Jaime -> Cersei ;"+NL+
                "Cersei -> Jaime ;"+NL+
                "Robert -> Cersei ;"+NL+
                "Cersei -> Robert ;"+NL+
                "Cersei -> Joffrey ;"+NL+
                "Cersei -> Myrcellar ;"+NL+
                "Cersei -> Tommen ;"+NL+
                "Jaime -> Joffrey [ style = dashed ];"+NL+
                "Jaime -> Myrcellar [ style = dashed ];"+NL+
                "Jaime -> Tommen [ style = dashed ];"+NL+
            "}"+NL+
            "Lyanna -> Rhaegar [ style = dashed , label = \" ? \" ];"+NL+
            "Rhaegar -> Lyanna [ style = dashed , label = \" ? \" ];"+NL+
            "Lyanna -> Jon [ style = dashed , label = \" ? \" ];"+NL+
            "Rhaegar -> Jon [ style = dashed , label = \" ? \" ];"+NL+
            "labelloc = \" t \" ;"+NL+
            "fontsize =50;"+NL+
            "fontcolor = lightslategrey ;"+NL+
            "fontname = \" Bookman Old Style Bold Italic \" ;"+NL+
            "label = \" Game of Thrones Family Tree \""+NL+
            "}" ; 

            VertexProvider<String> vp = (a, b) -> a;
        EdgeProvider<String, DefaultEdge> ep = (f, t, l, a) -> new DefaultEdge();
        GraphImporter<String, DefaultEdge> importer = new DOTImporter<String, DefaultEdge>(vp, ep);
        DirectedPseudograph<String, DefaultEdge> graph = new DirectedPseudograph<String, DefaultEdge>(DefaultEdge.class);
        try {
            importer.importGraph(graph, new StringReader(input));
        } catch (ImportException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    NaiveLcaFinder<String, DefaultEdge> graphFinder = new NaiveLcaFinder<>(graph);
        checkLcas(graphFinder, "Joffrey", "Tommen", Arrays.asList("Robert"));
    }