@Test
public void testDelayExport() throws Exception {

    delayService.export();
    assertTrue(delayService.getExportedUrls().isEmpty());
    //add 300ms to ensure that the delayService has been exported
    TimeUnit.MILLISECONDS.sleep(delayService.getDelay() + 300);
    assertThat(delayService.getExportedUrls(), hasSize(1));
}