spec/doubles/hash.rb


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class Hash
  def ordered_array
    to_a.sort { |(key1, value1), (key2, value2)| key1.hash <=> key2.hash }
  end

  def keys
    ordered_array.collect(&:first)
  end

  def values
    ordered_array.collect { |_, v| v }
  end

  def each(&block)
    ordered_array.each(&block)
  end

  def shift
    returning to_a.first do |k, v|
      delete(k)
    end
  end
end