Add action Staff::HomeController#show

app/controllers/staff/home_controller.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class Staff::HomeController < ApplicationController
+  # GET /staff
+  def show
+    authorize %i[staff home]
+  end
+end

app/policies/staff/home_policy.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class Staff::HomePolicy < ApplicationPolicy
+  def show?
+    account&.is_superuser?
+  end
+end

app/views/staff/home/show.html.erb

@@ -0,0 +1,2 @@
+<div class="container">
+</div>

config/routes.rb

@@ -44,6 +44,8 @@ Rails.application.routes.draw do
   #########################
 
   namespace :staff do
+    root to: 'home#show'
+
     authenticate :user,
                  ->(user) { user.account.can_access_sidekiq_web_interface? } do
       mount Sidekiq::Web, at: '/sidekiq', as: :sidekiq

spec/policies/staff/home_policy_spec.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Staff::HomePolicy do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/requests/staff/root_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'GET /staff' do
+  def make_request
+    get '/staff'
+  end
+
+  before do
+    sign_in current_account.user if current_account&.user
+    make_request
+  end
+
+  for_account_types nil, :guest, :usual do
+    specify do
+      expect(response).to have_http_status :forbidden
+    end
+  end
+
+  for_account_types :superuser do
+    specify do
+      expect(response).to have_http_status :ok
+    end
+  end
+end