Guardfile

guard 'spork', :wait => 60, :aggressive_kill => false, :notify_on_start => true do
  watch('test/test_helper.rb') { :test_unit }
end

guard 'minitest', :drb => true do
  watch(%r|^test/(.*)_spec\.rb|)
  watch(%r|^lib/(.*)([^/]+)\.rb|)     { |m| "test/#{m[1]}#{m[2]}_spec.rb" }
  watch(%r|^test/test_helper\.rb|)    { "test" }
end