anchor.diff:  set_app_env(Config, App, Name, Value) ->
       {_, []} = rpc:multicall(?OZ_NODES(Config), application, set_env, [App, Name, Value]),
       ok.
  -
   
   
   %%--------------------------------------------------------------------
  
positive.code:     test_utils:mock_expect(Nodes, PluginName, type, fun() -> harvester_plugin end),
      test_utils:mock_expect(Nodes, PluginName, ping,
          fun(?HARVESTER_ENDPOINT1) -> ok;
             (?HARVESTER_ENDPOINT2) -> ok;
             (_) -> ?ERROR_TEMPORARY_FAILURE
          end),
      test_utils:mock_expect(Nodes, PluginName, submit_batch, fun(_,HarvesterId,Indices, Batch) ->
          FirstSeq = maps:get(<<"seq">>, lists:nth(1, Batch)),
          {LastSeq, ErrorSeq} = lists:foldl(
              fun(BatchEntry, {A, undefined}) ->
  
negative.code:         Config, harvester_logic, submit_batch,
          [?PROVIDER(ProviderId), HarvesterId, Indices, SpaceId, Batch, MaxStreamSeq, MaxSeq]
      )).
  
  
  %%--------------------------------------------------------------------
  