test.rb

describe "#GET /3.x/auth/:to/callback" do
  it "creates a callback-request" do
    any_instance_of(API::Authentication::Service::CallbackRequest) do |callback|
      # Smell a refactor? I do.
      mock(callback).code=('foo')
      mock(callback).state=('bar')
      mock(callback).error_description=('')
      mock(callback).to=('facebook')
    end
    
    get "/3.0/auth/facebook/callback", { :code => 'foo', :state => 'bar', :error_description => '', :to => 'facebook'}
  end
  
  # ...
end