text: var records = [
      { id: 1, username: 'jack', password: 'secret', displayName: 'Jack', userType:'admin', emails: [ { value: 'jack@example.com' } ] }
    , { id: 2, username: 'jill', password: 'birthday', displayName: 'Jill', userType:'common', emails: [ { value: 'jill@example.com' } ] }
  ];
  
  exports.findById = function(id, cb) {
    process.nextTick(function() {
      var idx = id - 1;
      if (records[idx]) {
        cb(null, records[idx]);
      } else {
        cb(new Error('User ' + id + ' does not exist'));
      }
    });
  }
  
  exports.findByUsername = function(username, cb) {
    process.nextTick(function() {
      for (var i = 0, len = records.length; i < len; i++) {
        var record = records[i];
        if (record.username === username) {
          return cb(null, record);
        }
      }
      return cb(null, null);
    });
  }
  