@Test
  public void render() throws Exception {
    ARServer server = new ARServer("localhost", 8080);
    server.start();
    String r = sendMessage("circlepoints","Count","RedWhiteLinear", "localhost", 8080);
    server.stop();
    assertTrue(r, r.startsWith("{\"xOffset"));
  }
  public String sendMessage(String dataset, String aggregate, String transfer, String host, int port) throws Exception {
    dataset = URLEncoder.encode(dataset, "UTF-8");