test RSS format

spec/controllers/search_controller_spec.rb

@@ -28,6 +28,21 @@ RSpec.describe SearchController, type: :controller, elasticsearch: true do
       get :index, body: 'leipzig'
     end
 
+
+    it "returns rss" do
+      get :index, :format => "rss", body: 'leipzig'
+      expect(response).to be_success
+      expect(response).to render_template(:index)
+      expect(response.content_type).to eq("application/rss+xml")
+      expect(response.body).to have_tag "rss" do
+        with_tag "channel" do
+          with_tag "title"
+          with_tag "description"
+          with_tag "link"
+        end
+      end
+    end
+    
   end
 
 end