This package intentionally doesn't do anything.
The idea is that the acceptance test driver simply runs your app as usual but in test mode. So you can include extra testing files to make special APIs available to your acceptance test suite that won't be shipped to production or available in development.
Read more at http://guide.meteor.com/testing.html#acceptance
NOTE: Requires Meteor 1.3
meteor add tmeasday:acceptance-test-driver
meteor test --full-app --driver-package tmeasday:acceptance-test-driver
Then simply point your acceptance test runner at localhost:3000.