Rake task running headless JavaScript test with QUnit-Tap & PhantomJS

run_test.rake

namespace :test do
  
  desc "run headless test"
  task :run do
    tg = ENV['target'];
    runner = 'tmp.sh'
    
    unless tg
      puts "an argument required: target=path_to_test.hml"
      exit
    end
    
    url = File.expand_path tg
    Dir.chdir('test') do
      File.open(runner,'w') { |f| 
        f.puts "#!/bin/sh"
        f.puts "phantomjs run_qunit.js file://#{url}"
      }
      
      opts = if ENV['v'] || ENV['verbose']
        %w(-v)
      else
        []
      end    

      system "prove #{opts.join(' ')} #{runner}"      
    end
  end
end