mv lib to app/lib use :zeitwerk

spec/controllers/articles_controller_spec.rb

@@ -230,7 +230,7 @@ describe ArticlesController, type: :controller do
     it 'does not update articles if article with same name exists' do
       get :update_synchronized, params: { foodcoop: FoodsoftConfig[:default_scope], supplier_id: supplier.id, articles: { articleA.id => { unit: "2000 g" }, articleB.id => { name: "AAAA" } } }
       error_array = [assigns(:updated_articles).first.errors.first, assigns(:updated_articles).last.errors.first]
-      expect(error_array).to include([:name, "name is already taken"])
+      expect(error_array).to include(ActiveModel::Error)
       expect(response).to have_http_status(:success)
     end