How to stub gmaps4rails geocode functions in rspec tests?

I'm using gmaps4rails, and trying to develop some tests. I have a factory ``` factory :country do sequence(:name) { |n| "Country#{n}" } end ``` which is obviously not recognized by Google. ``` Validation failed: Gmaps4rails address Address invalid ``` The API calls are also taking time to run in my tests. How can I stub the API call out? I've tried adding ``` before(:each) Country.stub(:geocode) end ``` to the spec file but it has no effect. My model looks like this ``` class Country < ActiveRecord::Base acts_as_gmappable :lat => 'latitude', :lng => 'longitude' def gmaps4rails_address "#{self.name}" end geocoded_by :gmaps4rails_address after_validation :geocode end ``` Thanks for any ideas.