@Test
public void testSortDirected()
{

    Graph g = createGraph();
    NodeAccess na = g.getNodeAccess();
    na.setNode(0, 0, 1);
    na.setNode(1, 2.5, 2);
    na.setNode(2, 3.5, 3);
    g.edge(0, 1, 1.1, false);
    g.edge(2, 1, 1.1, false);
    GHUtility.sortDFS(g, createGraph());
}