class Minitest::Parallel::Executor

def << work; @queue << work; end

def initialize size
  @size  = size
  @queue = Queue.new
  @pool  = size.times.map {
    Thread.new(@queue) do |queue|
      Thread.current.abort_on_exception = true
      while job = queue.pop
        klass, method, reporter = job
        result = Minitest.run_one_method klass, method
        reporter.synchronize { reporter.record result }
      end
    end
  }
end

def shutdown
  size.times { @queue << nil }
  @pool.each(&:join)
end