Not Understanding Values inside classes

gistfile1.rb

  9 class DiceSet
 10   attr_accessor :values
 11   def initialize()
 12     @values = Array.new
 13   end  
 14   def roll(dices)
 15      @values.clear
 16      dices.times do |i|
 17      @values << 1 + rand(6)
 18      end
 19   end
 20 end
...
 49     dice.roll(5)
 50     first_time = dice.values
 51     dice.roll(5)
 52     second_time = dice.values
 53     assert_not_equal first_time, second_time,