@Test
public void testfetchAndSumBodies() throws Exception {

    try(Fetcher fetcher = new Fetcher()) {
        fetcher
            .fetchAndSumBodies("https://stackoverflow.com/", "https://dzone.com/", "https://github.com")
            .thenAccept(sum -> assertEquals(527801, sum.intValue()))
            .join();
    }
}