mk2.commit("/", "+\"test/mk22\":{}", null, null);
mk2.runBackgroundOperations();
mk3.runBackgroundOperations(); // pick up changes from mk2
NodeState base = ns3.retrieve(base3); // branch base
assertNotNull(base);
NodeState branchHead = ns3.retrieve(b3);
assertNotNull(branchHead);
TrackingDiff diff = new TrackingDiff();
branchHead.compareAgainstBaseState(base, diff);