`block in non_options': file not found: (ArgumentError) - ruby

Question

I'm trying to open browser url based on argument passed to script. Hence I wrote following ruby code:
require 'selenium-webdriver'
require 'test/unit'
class TestTitle < Test::Unit::TestCase
def setup
$driver = Selenium::WebDriver.for :firefox
if ARGV[0] == 'google'
$driver.get 'http://www.google.com'
elsif ARGV[0] == 'twitter'
$driver.get 'http://www.twitter.com'
end
end
def test_title
puts $driver.title
end
def teardown
$driver.quit
end
end
When I passed argument: ruby test.rb 'google', it results into following error:
c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:167:in `block in non_options': file not found: google (ArgumentError)
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:146:in `map!'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:146:in `non_options'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:207:in `non_options'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:52:in `process_args'
from c:/Ruby193/lib/ruby/1.9.1/minitest/unit.rb:891:in `_run'
from c:/Ruby193/lib/ruby/1.9.1/minitest/unit.rb:884:in `run'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:21:in `run'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:326:in `block (2 levels) in autorun'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:27:in `run_once'
from c:/Ruby193/lib/ruby/1.9.1/test/unit.rb:325:in `block in autorun'
Please help me understand what I'm doing wrong.

Answer 1

It appears that test-unit (as of 1.9.1) grabs command line options in its GlobOptions module. You are using ARGV[0] to pass browser name, but it thinks you're passing a file name. A workaround is to capture the value of ARGV[0] and then clear it before your test case runs:
browser = ARGV[0]
ARGV[0] = nil