Rails - May 2005 - error calling tests

Hiya!

 I get the following error when I try to run
xxxxx@xxxxx:/usr/lib/ruby/gems/1.8/gems/actionpack-1.8.1$ ruby
test/template/url_helper_test.rb
 
./test/template/../../lib/action_controller/base.rb:202: uninitialized constant
ActionController::Base::ClassInheritableAttributes (NameError)
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:18:in
`require__''
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:18:in
`require''
        from ./test/template/../../lib/action_controller.rb:34
        from ./test/template/../abstract_unit.rb:6:in `require''
        from ./test/template/../abstract_unit.rb:6
        from test/template/url_helper_test.rb:1:in `require''
        from test/template/url_helper_test.rb:1

 (the same with rake and the latest beta gem (actionpack-1.8.1.1264) too btw)

 Any help appreciated!


 tia, bye
 Wolfgang