code: function (id) {
              var id = id + "";
              if (id && id.indexOf("+") != -1) {
                  if (Aria.testMode) {
                      return this.$getAutoId(id);
                  }
                  return null;
              }
              return this.$getId(id);
          }
docs: Return the generated domId for specified id.
  @param {String|Number} id specified in the template. If it contains "+", an automatic id will be
  generated if in the test mode.
  @return {String}