Fixed that the mail method should return a Mail::Message (#15113).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12210 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/mailer_test.rb

@@ -725,6 +725,10 @@ class MailerTest < ActiveSupport::TestCase
     end
   end
 
+  def test_mail_should_return_a_mail_message
+    assert_kind_of ::Mail::Message, Mailer.test_email(User.find(1))
+  end
+
   private
 
   def last_email