Rails3: test: replace deprecated errors.on at test_validate_mail_notification_inclusion of unit/user_test.rb

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7593 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/user_test.rb

@@ -344,7 +344,7 @@ class UserTest < ActiveSupport::TestCase
     u = User.new
     u.mail_notification = 'foo'
     u.save
-    assert_not_nil u.errors.on(:mail_notification)
+    assert_not_nil u.errors[:mail_notification]
   end
 
   context "User#try_to_login" do