code: function maybeJsdomError(error)
  {
          if (jsdomErr)
          {
                  error.message += '\nJsdom might fail to load because of this error: ' +
                                   jsdomErr.message +
                                   '\n' +
                                   jsdomErr.stack;
          }
  
          error.jsdomCause = jsdomErr;
  
          return error;
  }
docs: /* istanbul ignore next