tracker.start();
Assert.assertEquals(ImmutableSetMultimap.<String, String>of(),
usersQueue.poll(5, TimeUnit.SECONDS));
ZooKeeperMonitor.TableUserRegistration userRegistration =
zkMonitor.newTableUserRegistration(userID, tableURI);
try {
userRegistration.updateRegisteredLayout(layout1);
Assert.assertEquals(ImmutableSetMultimap.of(userID, layout1),
usersQueue.poll(5, TimeUnit.SECONDS));