anchor.diff:  
       spawn_at_nodes(Workers, ThreadsNum, ConflictedThreads, TestFun),
       OpsNum = ThreadsNum * DocsPerThead * OpsPerDoc,
  -    {OkNum, _OkTime, ErrorNum, ErrorTime} = count_answers(OpsNum),
  +    {OkNum, _OkTime, ErrorNum, ErrorTime, _ErrorsList} = count_answers(OpsNum),
       ?assertEqual(0, OkNum),
       ?assertEqual(OpsNum, ErrorNum),
   
  
positive.code: 
      spawn_at_nodes(Workers, ThreadsNum, ConflictedThreads, TestFun),
      OpsNum = ThreadsNum * DocsPerThead * OpsPerDoc,
      {OkNum, OkTime, ErrorNum, ErrorTime} = count_answers(OpsNum),
      ?assertEqual(OpsNum, OkNum+ErrorNum),
      % TODO change when datastore behavior will be coherent
      ct:print("Create ok num: ~p", [OkNum]),
  
negative.code: 
      spawn_at_nodes(Workers, ThreadsNum, ConflictedThreads, TestFun),
      OpsNum = ThreadsNum * DocsPerThead * OpsPerDoc,
      {OkNum, OkTime, _ErrorNum, _ErrorTime, ErrorsList} = count_answers(OpsNum),
      ?assertEqual(OpsNum, OkNum),
      ?assertEqual([], ErrorsList),
  
      TestFun2 = fun(DocsSet) ->
          for(1, DocsPerThead, fun(I) ->
  