@Override
    public Optional<PiPipeconf> getPipeconf(PiPipeconfId id) {
        return Optional.ofNullable(pipeconfs.get(id));
    }
@Test
    public void getPipeconf() {
        mgr.register(pipeconf);
        assertEquals("Returned PiPipeconf is not correct", pipeconf,
                     mgr.getPipeconf(pipeconf.id()).get());
    }