die.rb

class Die

	attr_accessor :selected

	def initialize
		@selected = false
	end

end

die_spec.rb

require 'rspec'

describe Die do

	let(:die) {Die.new}

	describe "#new" do
		it "creates a Die object" do
			expect(die).to be_an_instance_of(Die)
		end

		it "sets selected to false" do
			expect(die.selected).to eq(false)
		end
	end

end

player.rb

require_relative 'die'
require 'debugger'

class Player

	attr_reader :total_score, :dice_set

	def initialize
		@total_score = 0
		@dice_set = []
	end

	def roll_dice
		@dice_set = [Die.new] * 6
	end

	def make_selection(*indices)
		# debugger
		indices.each do |selection|
			index = selection - 1
			die = @dice_set[index]
			die.selected = true
		end
		@dice_set.each {|die| print "#{die.selected} "}
	end

end

player_spec.rb

require 'rspec'
require_relative 'player'

describe Player do
	let(:player) { Player.new }

	describe "#new" do
		it "creates Player object" do
			expect(player).to be_an_instance_of(Player)
		end

		it "sets player's total score" do
			expect(player.total_score).to eq(0)
		end
	end

	describe "#roll_dice" do
		it "generates array of 6 die" do
			expect(player.roll_dice.length).to eq(6)
			expect(player.roll_dice.first).to be_an_instance_of(Die)
		end

		it "sets dice to dice_set" do
			player.roll_dice
			expect(player.dice_set.length).to eq(6)
		end
	end

	describe "#make_selection" do
		it "changes die values to selected with 1 value" do
			player.roll_dice
			player.make_selection(1)
			expect(player.dice_set[0].selected).to eq(true)
		end

		it "changes die values to select with more than 1 value" do
			player.roll_dice
			player.make_selection(1,3)
			expect(player.dice_set[2].selected).to eq(true)
		end

		it "does not change die that are not selected" do
			player.roll_dice
			player.make_selection(1)
			expect(player.dice_set[5].selected).to eq(false)
		end
	end

end

Goal: to create a Farkle game in pure ruby using Rspec and TDD. Eventually a user will be able to select one or more dice in a set of 6.

Problem: My #make_selection method in the Player class is not working the way I intend it to. If the method is given one or more numbers to represent the user's selection, I want to be able to change the "selected" attribute of the Die objects in the @dice_set array to TRUE.

After lots of debugging I determined that line 22 in the player.rb file is assigning ALL of the Die objects in the dice_set selected attribute to TRUE, rather than the die at a particular index. You can see this from the output from line 24.

I'm trying to understand why this is changing the attributes of ALL the objects in the array, and whether or not there is a better option to achieve this goal.

Figured it out (with some help)! In the roll_dice method, I was creating an array of 6 die that were the SAME object.

now it is
6.times {@dice_set << Die.new}
@dice_set