BlobClusterStateStore store = new BlobClusterStateStore(spec);
store.save(expected);
/* load and check the stored state */
Cluster stored = store.load();
Cluster.Instance first = Iterables.getFirst(stored.getInstances(), null);
assertNotNull(first);
assertThat(first.getId(), is("region/id1"));
assertThat(first.getRoles().contains("role1"), is(true));