ns2.merge(builder2, EmptyHook.INSTANCE, CommitInfo.EMPTY);
// wait at least _modified resolution. in reality the wait may
// not be necessary. e.g. when the clock passes the resolution boundary
// exactly at this time
clock.waitUntil(System.currentTimeMillis() +
SECONDS.toMillis(MODIFIED_IN_SECS_RESOLUTION + 1));
builder1 = ns1.getRoot().builder();
builder1.child("node").child("child-1");
ns1.merge(builder1, EmptyHook.INSTANCE, CommitInfo.EMPTY);