Rails - Mar 2013 - rails test abstrct_unit

anyone help? When I try to test my file, I always get this:


macworld@macworld-virtual-machine:~/rails/activerecord$ ruby -Itest 
test/cases/type_cast_test.rb
/home/macworld/.rvm/rubies/ruby-1.9.3-p362/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'': cannot load such file -- abstract_unit (LoadError)
from 
/home/macworld/.rvm/rubies/ruby-1.9.3-p362/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require''
from test/cases/type_cast_test.rb:1:in `<main>''
macworld@macworld-virtual-machine:~/rails/activerecord$ 

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