Not able to pass command line arguments ARGV to Ruby

Question

require "selenium-webdriver"
gem "test-unit"
require "test/unit"

class GiftcardCheckout < Test::Unit::TestCase

def test_giftcard_checkout
   puts ARGV.length
end

I am invoking above ruby program running on Windows 7 using ruby giftcard_checkout.rb local from command line. The problem here is that ARGV.length is always 0 - basically the arguments are not being passed to ruby interpreter. Did go through many similar post,set the associations & file type - but did not work.

assoc .rb returns .rb=rbFile

ftype rbFile returns "C:\Ruby193\bin\ruby.exe" "%1" %*

Could this be something to do with Test Unit?