desc "Run all tests for rbgooey with rcov"
Spec::Rake::SpecTask.new('gui') do |t|
  t.spec_files = FileList['rbgooey/test/*.rb']
  t.rcov = true
  t.ruby_opts  ['--exclude', 'lib\/spec,bin\/spec']
end

rake gui
(in /home/kiba/dynpet/Trunk)
/usr/bin/ruby1.8 --exclude /usr/local/lib/site_ruby -I"/usr/lib/ruby/gems/1.8/gems/rspec-0.8.2/lib" -S rcov --exclude lib\/spec,bin\/spec,config\/boot.rb -o "coverage" "/usr/lib/ruby/gems/1.8/gems/rspec-0.8.2/bin/spec" -- "rbgooey/test/test.rb"
/usr/bin/ruby1.8: invalid option --exclude  (-h will show valid options)