File: recursive_check_thread_safety_spec.rb

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require 'rspec'

describe 'Joining an array that contains arrays' do
  it 'should work across multiple threads without error' do
    a = [(1..100).to_a]
    lambda do
      result = (1..100).map { Thread.new { 10.times { a.join }; :ok } }.map(&:value)
      result.should == [:ok] * 100
    end.should_not raise_exception
  end
end