Hash <-> Date

hash_date.rb

class Hash
  def to_date
    Date.new fetch(:year), fetch(:month), fetch(:day)
  end
end

class Date
  def to_hash
    {year: year, month: month, day: day}
  end
end

require 'minitest/autorun'
require 'minitest/spec'

describe "core extensions" do
  describe "hash" do
    it "should have to_date" do
      res = {year: 2015, month: 12, day:25}.to_date
      assert res.is_a?(Date)
      assert_equal 2015, res.year
      assert_equal 12, res.month
      assert_equal 25, res.day
    end
  end
  describe "date" do
    it "should have to_hash" do
      res = Date.new(2015,12,25).to_hash
      assert res.is_a?(Hash)
      assert_equal 2015, res[:year]
      assert_equal 12, res[:month]
      assert_equal 25, res[:day]
    end
  end
end