Parallel minitest

fail.rb

require 'rubygems'

$at_once = '3'
$total = 6

ENV['N'] = $at_once

require 'selenium-webdriver'
require 'minitest'
require 'minitest/hell'
require 'minitest/autorun'

$count = 0

class TestRandom2 < Minitest::Test
  1.upto($total) do |n|
    define_method("test_#{n}") do
      thread = Thread.new do
        Thread.current.abort_on_exception = true
        wd = Selenium::WebDriver.for :firefox
        $stdout.puts "\nWEBDRIVER ##{ $count += 1 }\n"
        $stdout.puts '~~~~~'
        wd.quit
      end
      thread.join
    end
  end
end

parallel.rb

# Run with: ruby parallel.rb
# requires minitest 5.0.6 or better.
# gem install minitest
require 'rubygems'

ENV['N'] = '10' # run 10 tests in parallel

require 'minitest'
require 'minitest/hell'
require 'minitest/autorun'

def random_code
  sleep 1 # sleep so we can visually see that tests complete in batches of 10
  assert_equal(Random.rand(2), 1)
end

module TestRandom
  # run the same test 100 times by defining 100 methods
  # using the contents of one test
  1.upto(100) do |n|
    define_method("test_#{n}") do
     random_code
    end
  end
end

class TestRandom2 < Minitest::Test
  include TestRandom
end