error

 1) Backend::CustomersController routing effectue l'action show
     Failure/Error: get :index
     ActionController::RoutingError:
       Not Found
     # ./app/controllers/backend/application_controller.rb:47:in `not_found'
     # ./app/controllers/backend/application_controller.rb:35:in `rescue in current_shop'
     # ./app/controllers/backend/application_controller.rb:32:in `current_shop'
     # ./app/controllers/backend/application_controller.rb:40:in `scope_current_shop'
     # ./spec/controllers/backend/customers_controller_spec.rb:9:in `block (3 levels) in <top (required)>'

rake route

backend_customers GET      (/:locale)/backend/customers(.:format)                                             backend/customers#index {:locale=>/fr|it/}

test.rb

require 'spec_helper'

describe Backend::CustomersController do
  describe "routing" do
    let(:user) { FactoryGirl.create(:user)}
    it "effectue l'action show" do
      get :index
      expect(response).to be_success
      # get :show, id: user.id
      # expect(response).to be_success
    end
  end
end