Ruby on Rails

How do I test this in Rspec. I am pretty very new to Rspec. Please help.
I tried like the below

    describe "next " do
      it "routes /queues/:queue_id/next" do
        { :get => "/queues/regular_queue/next" }.should route_to(
          :controller => "queue_items",
          :action => "next",
          :queue_id => "regular_queue",
          :format => "json"
            )
        assigns(:queue).should_not be_nil
        expect(response).to be_success
      end

But it is not at all coming inside my next action in controller.