Unit testing [Rails 3.2.3] setup_and_teardown

I am running the unit tests according to the doc; when failing I get a
lot of error trace regarding setup_and_teardown.rb
why ? what's missing ?

thanks for feedback

ruby -Itest test/unit/area_test.rb

Loaded Suite test,test/functional,test/performance,test/unit,test/unit/
helpers

Started at 2012-04-28 16:50:01 +0200 w/ seed 14004.

AreaTest
     FAIL (0:00:00.103) test_should_not_save_area_without_name
          Saved the area without a name
        @ test/unit/area_test.rb:10:in `block in <class:AreaTest>'
          /Users/yves/.rvm/gems/ruby-1.9.3-p125@rails32/gems/
activesupport-3.2.3/lib/active_support/testing/setup_and_teardown.rb:
35:in `block in run'
          /Users/yves/.rvm/gems/ruby-1.9.3-p125@rails32/gems/
activesupport-3.2.3/lib/active_support/callbacks.rb:425:in
`_run__2008357061900762550__setup__2421286496846222409__callbacks'
          /Users/yves/.rvm/gems/ruby-1.9.3-p125@rails32/gems/
activesupport-3.2.3/lib/active_support/callbacks.rb:405:in
`__run_callback'
          /Users/yves/.rvm/gems/ruby-1.9.3-p125@rails32/gems/
activesupport-3.2.3/lib/active_support/callbacks.rb:385:in
`_run_setup_callbacks'

[SOLVED] As I am now using Rails 3.2.3 , I should get rid of the gem
'turn' in my Gemfile ( group test )

group :test do
  # Pretty printed test output
  gem 'turn', :require => false <= should be deleted !!!
  gem 'minitest'

thanks to myself