back out r6117. use ActionView::TestCase instead of HelperTestCase at IssuesHelperTest....
back out r6117. use ActionView::TestCase instead of HelperTestCase at IssuesHelperTest.
Tests on CI server fail.
git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6119 e93f8b46-1217-0410-a6f0-8f06a7374b81