Problems running rake test (possibly gem/debian issues)

So i have a small update, having now removed all versions of cucumber

~/code/tradertips(with_clearance) $ sudo gem uninstall cucumber
[sudo] password for keith:

Select gem to uninstall:
1. cucumber-0.3.6
2. cucumber-0.3.11
3. All versions

3

blah blah....

This allows me to run the install command:

~/code/tradertips(with_clearance) $ sudo rake gems:install
RAILS_ENV=test
(in /home/keith/workspace/tradertips)
gem install cucumber --version "= 0.3.0"
Successfully installed cucumber-0.3.0
1 gem installed
Installing ri documentation for cucumber-0.3.0...
Installing RDoc documentation for cucumber-0.3.0...

Which only spits me out at this problem:

~/code/tradertips(with_clearance) $ rake test
(in /home/keith/workspace/tradertips)
rake aborted!
undefined method `fork=' for #<Cucumber::Rake::Task:0xb79b4be8>
/home/keith/workspace/tradertips/Rakefile:10
(See full trace by running task with --trace)

Which i assume is a dependency issue. So i re-install the lastest
cucumber:

~/code/tradertips(with_clearance) $ sudo gem install cucumber
Successfully installed cucumber-0.3.11
1 gem installed
Installing ri documentation for cucumber-0.3.11...
Installing RDoc documentation for cucumber-0.3.11...

And try running tests again:

~/code/tradertips(with_clearance) $ rake test
(in /home/keith/workspace/tradertips)
/usr/bin/ruby1.8 -I"lib:test"
"/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
"test/unit/clearance_mailer_test.rb" "test/unit/mailer_test.rb"
"test/unit/helpers/passwords_helper_test.rb"
"test/unit/helpers/users_helper_test.rb"
"test/unit/helpers/confirmations_helper_test.rb"
"test/unit/helpers/home_helper_test.rb"
"test/unit/helpers/invites_helper_test.rb"
"test/unit/helpers/sessions_helper_test.rb" "test/unit/user_test.rb"
"test/unit/invite_test.rb"
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/test_case.rb:6:
warning: already initialized constant Mocha
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/dependencies.rb:443:in
`load_missing_constant': uninitialized constant Clearance::Test
(NameError)
  from
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/dependencies.rb:80:in
`const_missing'
  from ./test/unit/clearance_mailer_test.rb:5
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in
`load'
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in
`each'
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
/usr/bin/ruby1.8 -I"lib:test"
"/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
"test/functional/passwords_controller_test.rb"
"test/functional/confirmations_controller_test.rb"
"test/functional/invites_controller_test.rb"
"test/functional/home_controller_test.rb"
"test/functional/sessions_controller_test.rb"
"test/functional/users_controller_test.rb"
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/test_case.rb:6:
warning: already initialized constant Mocha
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/dependencies.rb:443:in
`load_missing_constant': uninitialized constant Clearance::Test
(NameError)
  from
/home/keith/workspace/tradertips/vendor/rails/activesupport/lib/active_support/dependencies.rb:80:in
`const_missing'
  from ./test/functional/passwords_controller_test.rb:8
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in
`load'
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in
`each'
  from
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
/usr/bin/ruby1.8 -I"lib:test"
"/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
Errors running test:units and test:functionals!

So this is a different error, which may or may not be good, but i'm
still no better off.

Any advice would be most welcome, thanks...

Am i doing something wrong here?