Add specs for domain list export

#248

spec/features/registrar/domains/csv_export_spec.rb

@@ -0,0 +1,8 @@
+require 'rails_helper'
+
+RSpec.feature 'CSV Export', db: true do
+  scenario 'csv file download' do
+    visit registrar_domains_path
+    click_on 'download-domains-csv-btn'
+  end
+end

spec/routing/registrar/domains_routing_spec.rb

@@ -0,0 +1,9 @@
+require 'rails_helper'
+
+RSpec.describe Registrar::DomainsController do
+  describe 'routing' do
+    it 'routes to #index' do
+      expect(get: '/registrar/domains').to route_to('registrar/domains#index')
+    end
+  end
+end