ruby insertion sort

ruby_insertion_sort.rb

# insertion sort
class Sequence
  attr_accessor :values, :size

  def initialize(array)
    @values = array
    @size = array.length
  end

  def sort
    result = values.dup

    values.each_with_index do |item, i|
      j = i
      while j > 0 && result[j - 1] > item
        result[j] = result[j - 1]
        j -= 1
      end
      result[j] = item
    end
    result
  end
end

require 'rspec/autorun'

RSpec.describe Sequence do
  let(:org_array) do
    [2,5,6,7]
  end

  it 'if sorted return sorted' do
     seq = Sequence.new(org_array)
     expect(seq.sort).to eq org_array
  end

  it 'if inverse sorted return sorted' do
    seq = Sequence.new(org_array.reverse)
    expect(seq.sort).to eq org_array
  end

  it 'if unsorted return sorted' do
    seq = Sequence.new([5,2,7,6])
    expect(seq.sort).to eq [2,5,6,7]
  end
end