anchor.diff:      {ok, PNCounter2, CommitTime2} = materialize(crdt_pncounter,
                                         PNCounter, ignore,
                                         vectorclock:from_list([{2,2},{1,2}]),
  -                                      Ops, ignore, ignore),
  +                                      Ops, ignore),
       ?assertEqual({4, {2,1}}, {crdt_pncounter:value(PNCounter2), CommitTime2}),
       
       
  
positive.code:   InSnapshot = OpCommitTime =< Ts,
    case SnapshotCommitTime of
      ignore -> 
      	InSnapshot;
      {_SnapshotDc, _SnapshotCT} ->
  		    	InSnapshot andalso is_smaller(SnapshotCommitTime, OperationCommitTime)
  	end.
  
  %% @doc Checks whether a commit time is smaller than another one.
  
negative.code:     Ops = [],
      {ok, PNCounter2, ignore} = materialize(crdt_pncounter, PNCounter, ignore,
                                  vectorclock:from_list([{1,1}]),
                                  Ops, ignore),
      ?assertEqual(0,crdt_pncounter:value(PNCounter2)).
  
  materializer_eager_clocksi_test()->
  