anchor.diff:  -include("tts.hrl").
   
   %% API.
  --export([start_link/0]).
  +-export([start_link/2]).
   -export([set_user_info/2]).
   -export([get_user_info/1]).
   -export([get_credential_list/1]).
  
positive.code: 
  %% gen_server.
  
  init([]) ->
  	{ok, #state{}, 5000}.
  
  handle_call({set_user_info,UserInfo}, _From, State) ->
      {reply, ok, State#state{user_info=UserInfo}};
  
negative.code: -export([code_change/3]).
  
  -record(state, {
            sub = undefined,
            iss = undefined,
            user_info = #{},
            credentials = [],
            sessions = []
  