add item set with scaffold

test/system/item_sets_test.rb

@@ -0,0 +1,9 @@
+require "application_system_test_case"
+
+class Settings::ItemSetsTest < ApplicationSystemTestCase
+  # test "visiting the index" do
+  #   visit settings_item_sets_url
+  #
+  #   assert_selector "h1", text: "Settings::ItemSet"
+  # end
+end