Functional testing a controller with a scoped path?!?

gistfile1.rb

#routes
  scope :path => 'shipping_reports', :controller => 'ShippingReports', :as => 'shipping_reports' do
    get 'index'
  end

#test
class ShippingReportsControllerTest < ActionController::TestCase
 test "routing" do
    assert_routing '/shipping_reports/index', { :controller => "ShippingReports", :action => "index" }
  end

  test 'index' do
    get :index, :controller => 'ShippingReports'
    assert_response :success
  end
end
# first passes, second fails with:
#ActionController::RoutingError: No route matches {:controller=>"shipping_reports"}