ConcurrentUnitTest
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ConcurrentUnitTest allows to run unit tests concurrently.
Ruby interpreter does not use native threads, so if the unit tests are CPU bound then 
there is no need to run unit tests concurrently. If unit tests IO bound, especially 
if they write/read database, running them concurrently can dramatically speed up execution.
If you use JRuby even running CPU bound tests may be beneficial, because JRuby uses
native threads, so eventually different tests may run on different cores.


Sample usage.

require 'test/unit/concurrent/concurrenttestunit'

class MyTestCase < Test::Unit::ConcurrentTestCase

  def test_one
  end

  def test_two
  end	
end

Test::Unit::Concurrent::ConcurrentTestRunner.run(MyTestCase)