code: function () {
      var self = this;
      _.each(_.clone(self._subscriptions), function (sub, id) {
        // Avoid killing the autoupdate subscription so that developers
        // still get hot code pushes when writing tests.
        //
        // XXX it's a hack to encode knowledge about autoupdate here,
        // but it doesn't seem worth it yet to have a special API for
        // subscriptions to preserve after unit tests.
        if (sub.name !== 'meteor_autoupdate_clientVersions') {
          self._send({msg: 'unsub', id: id});
          delete self._subscriptions[id];
        }
      });
    }
docs: This is very much a private function we use to make the tests take up fewer server resources after they complete.