Add tests

test/integration/admin_area/domain_test.rb

@@ -0,0 +1,18 @@
+require 'test_helper'
+
+class DomainTest < ApplicationIntegrationTest
+  setup do
+    @domain = domains(:shop)
+    sign_in users(:admin)
+  end
+
+  def test_downloads_domain
+    filename = "#{@domain.name}.pdf"
+    get download_admin_domain_path(@domain)
+
+    assert_response :ok
+    assert_equal 'application/pdf', response.headers['Content-Type']
+    assert_equal "attachment; filename=\"#{filename}\"; filename*=UTF-8''#{filename}", response.headers['Content-Disposition']
+    assert_not_empty response.body
+  end
+end