@Test
@Ignore("cannot pass in travis")
public void testUnexport() throws Exception {

    System.setProperty(Constants.SHUTDOWN_WAIT_KEY, "0");
    try {
        service.export();
        service.unexport();
        Thread.sleep(1000);
        Mockito.verify(exporter, Mockito.atLeastOnce()).unexport();
    } finally {
        System.clearProperty(Constants.SHUTDOWN_TIMEOUT_KEY);
    }
}