@Override
    public boolean removeMembershipListener(@Nonnull UUID registrationId) {
        return clusterService.removeMembershipListener(registrationId);
    }
@Test
    public void removeMembershipListener() {
        Cluster cluster = client().getCluster();
        UUID regId = cluster.addMembershipListener(new MembershipAdapter());
        assertTrue(cluster.removeMembershipListener(regId));
    }