Assert two enumerables to be equal, not minding the order

assert_unordered_equal.rb

module Test::Unit::Assertions
  def assert_unordered_equal(expected, actual, message=nil)
    full_message = build_message(message, "<?> expected but was\n<?>.\n", expected, actual)
    assert_block(full_message) {
      seen = Hash.new(0)
      expected.each { |e| seen[e] += 1 }
      actual.each { |e| seen[e] -= 1 }
      seen.invert.keys == [0]
    }
  end
end