Admin controller test

test/controllers/admin_controller_test.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+require 'test_helper'
+
+class AdminControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    stub_fetch_subject_enabled(value: false)
+    stub_notifications_request
+    @user = create(:user)
+    stub_env_var 'ADMIN_GITHUB_IDS'
+  end
+
+  test 'render 404 if user isnt admin' do
+    sign_in_as(@user)
+
+    assert_raises ActionController::RoutingError do
+      get '/admin'
+    end
+  end
+end