@Test
    public void vertexIsAdded()
    {
        Vertex v = vc.addVertex(3, 5);
        Vertex test = vc.getVertices().toLinkedList().getNext();
        assertTrue(v.X() == 3 && v.Y() == 5 && 
                test.X() == 3 &&
                test.Y() == 5);
    }