Settings controllers specs (#23915)

spec/controllers/settings/exports/blocked_domains_controller_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Settings::Exports::BlockedDomainsController do
+  render_views
+
+  describe 'GET #index' do
+    it 'returns a csv of the domains' do
+      account = Fabricate(:account, domain: 'example.com')
+      user = Fabricate(:user, account: account)
+      Fabricate(:account_domain_block, domain: 'example.com', account: account)
+
+      sign_in user, scope: :user
+      get :index, format: :csv
+
+      expect(response.body).to eq "example.com\n"
+    end
+  end
+end