Pass files or directories to autotest

.autotest.rb

# If you have a large test suite, being able to test only a subset
# of those items is a big speed boost.
#
# With this in your .autotest file you can run "autotest /some/dir" and only test 
# the files within.
#
require 'redgreen/autotest'

Autotest.add_hook :initialize do |at|
  unless ARGV.empty?
    at.find_directories = ARGV
  else
    # ... your original mappings here
  end
end