test/mailers/user_mailer_test.rb

   1 require "test_helper"
   2
   3 class UserMailerTest < ActionMailer::TestCase
   4   def test_html_layout_is_used
   5     email = UserMailer.message_notification(create(:message))
   6
   7     assert_match(/<html lang=/, email.html_part.body.to_s)
   8   end
   9 end