Meteor js, iron-router, unit testing with Route.go('...') in server side doesn't work

I need to go to a specific router to test publish behavior, I'm using iron router package, Router.go('...'), but doesn't work in server side , it throw me an error:

   //XXX this assumes no other routers on the parent stack which we should probably fix      // 14
   I20150220-18:47:00.749(-4)?     router.dispatch(req.url, {                                                                // 15
   I20150220-18:47:00.750(-4)?       request: req,                                                                           // 16
   I20150220-18:47:00.750(-4)?       response: res                                                                           // 17
   I20150220-18:47:00.750(-4)?     }, next);                                                                                 // 18
   I20150220-18:47:00.750(-4)?   } has no method 'go'
   I20150220-18:47:00.750(-4)?     at packages/velocity:test-proxy/tests/mocha/server/publish/folders-publisher-tests.js:23:1
   I20150220-18:47:00.750(-4)?     at wrappedFunc (packages/mike:mocha/server.js:204:1)
   I20150220-18:47:00.751(-4)?     at runWithEnvironment (packages/mike:mocha/server.js:156:1)

My routers files are in lib, and I've already tried calling a method in my routers controller, but also doesn't work, does some one has a clue what it could be???? please