server.stop();
        }
    }

    @Test
    public void test_execute_2instance() throws Exception {
        final CrawlerWebServer server1 = new CrawlerWebServer(0);
        server1.start();
        final CrawlerWebServer server2 = new CrawlerWebServer(0);
        server2.start();

        final String url1 = "http://localhost:" + server1.getPort() + "/";