Assignment6.rb

require 'rspec'

class Game
  attr_reader :game_values
  def initialize
    @game_values = %w{rock paper scissors}
  end

  def start(guess)
    if game_values.include? guess
      computer_guess
    else
      "Not Okay"
    end
  end

  def computer_guess
    game_values.sample
  end
end


describe Game do
  before do
    @game = Game.new
  end

  it "should only allow three input values" do
    @game.game_values.should == %w{rock paper scissors}
  end

  it "should say 'Not Okay' when it gets another input value" do
    @game.start("cup").should == "Not Okay"
  end

  it "should respond with one of the three game values" do
    @game.game_values.should include(@game.start("rock"))
    @game.game_values.should include(@game.start("paper"))
    @game.game_values.should include(@game.start("scissors"))
  end

  it "should return 'computer wins' if user guesses 'rock' and computer guesses 'paper'" do
    @game.stub(:start).and_return("paper")
    @game.start("rock").should == "paper"
  end
end

Be careful, the stub is syntactically correct but does not really test anything at the moment. Fix this, by refactoring the code!