Backout replacing shoulda context of test/unit/helpers/issues_helper_test.rb. Test methods in shoulda context do not run on Ruby 1.8.7-p370. git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10689 e93f8b46-1217-0410-a6f0-8f06a7374b81