anchor.diff:  -spec domain_to_provider_id(Domain :: atom()) -> binary().
   domain_to_provider_id(Domain) ->
       atom_to_binary(Domain, utf8).
  +
  +-spec set_default_onezone_domain(Config :: proplists:proplist()) -> ok.
  +set_default_onezone_domain(Config) ->
  +    Workers = ?config(op_worker_nodes, Config),
  +    ok = test_utils:set_env(Workers, op_worker, oz_domain, ?DEFAULT_ONEZONE_DOMAIN).
   
   %%--------------------------------------------------------------------
   %% @doc
  
positive.code: 
  -define(TOKENS_SECRET, <<"secret">>).
  -define(TEMPORARY_TOKENS_GENERATION, 1).
  
  %%%===================================================================
  %%% API
  
negative.code: 
  %% API
  -export([
      set_default_onezone_domain/1,
      create_access_token/1, create_access_token/2, create_access_token/3,
      create_identity_token/1,
      setup_session/3, teardown_session/2,
  