create controller

app/assets/stylesheets/cities.scss

+// Place all the styles related to the Cities controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: https://sass-lang.com/

app/assets/stylesheets/industries.scss

+// Place all the styles related to the Industries controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: https://sass-lang.com/

app/controllers/cities_controller.rb

+class CitiesController < ApplicationController
+end

app/controllers/industries_controller.rb

+class IndustriesController < ApplicationController
+end

app/helpers/cities_helper.rb

+module CitiesHelper
+end

app/helpers/industries_helper.rb

+module IndustriesHelper
+end

test/controllers/cities_controller_test.rb

+require "test_helper"
+
+class CitiesControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/controllers/industries_controller_test.rb

+require "test_helper"
+
+class IndustriesControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end