anchor.diff:      basic_op,
       update_doc,
       async_update,
  +    revision_conflict,
       bad_doc,
       create_doc,
       docs_count,
  
positive.code:   {ok, <<"a">>, _RevId2} = barrel_local:delete(<<"testdb">>, <<"a">>, RevId2, []),
    {error, not_found} = barrel_local:get(<<"testdb">>, <<"a">>, []),
    {ok, <<"a">>, _RevId3} = barrel_local:put(<<"testdb">>, Doc, []).
  
  
  async_update(_Config) ->
  
negative.code: -export([
    basic_op/1,
    update_doc/1,
    async_update/1,
    revision_conflict/1,
    bad_doc/1,
    create_doc/1,
    docs_count/1,
  