Ruby初学者：类，实例变量，访问器，rspec

Question

所以我正在试图重新创建一个叫做Ciao Ciao的棋盘游戏。我没有接近完成，但我一直陷入困境，真的很感谢一些帮助。到目前为止，我已经做了以下3类和RSpec文件：

Player类

require_relative 'die' 

class Player 
attr_reader :name 
attr_accessor :token, :position, :point 

def initialize(name, token, position, point) 
    @name = name 
    @token = token 
    @position = position 
    @point = point 
end 

def advance 
    @position += @number #basically I want the player to advance when he rolls between 1-4 but not sure how to connect it to the Die class here. 
end 

def lie 
    @token -= 1 #here I want the player to lose a token if he rolls between 5-6 
    @position == 0 #and have to start again from position 0 
end 

def score 
    @token -= 1 
    @position == 0 
    @point += 1 
end 
end 

Game类

require_relative 'player' 
require_relative 'die' 

class Game 
def initialize(title) 
    @title = title 
    @players = [] 
end 

def join(player) 
    @players << player 
end 

def play 
    puts "There are #{@players.size} players in the current round of #{@title}." 
    @players.each do |player| 
    die = Die.new 
    case die.roll 
    when 1..4 
     puts "#{player.name} just rolled #{die.roll}!" 
     player.advance 
     puts "#{player.name} advances to #{player.position}!" 
    when 5..6 
     puts "#{player.name} just rolled #{die.roll}!" 
     player.lie 
     puts "#{player.name} is down to #{player.token} and starts at #{player.name}!" 
    end 

    puts "#{player.name} has #{player.point} points and is at #{player.position}. He has #{player.token} token(s) left." 

    if player.position >= 10 
     player.score 
     puts "#{player.name} scores a point for reaching the endzone!" 
    end 

    if player.token == 0 
     @players.delete(player) 
     puts "#{player.name} has been eliminated." 
    end 
    end 
end 
end 

模具类

class Die 
attr_reader :number 

def initialize 
end 

def roll 
    @number = rand(1..6) 
end 
end 

RSpec的文件

require_relative 'game' 

describe Game do 
before do 
    @game = Game.new("chaochao") 

    @initial_token == 4 
    @initial_position == 0 
    @initial_point == 0 
    @player = Player.new("iswg", @initial_token, @initial_position, @initial_point) 

    @game.join(@player) 
end 

it "advances the player if a number between 1 and 4 is rolled" do 
    @game.stub(:roll).and_return(3) 
    @game.play 
    @player.position.should == @initial_position + 3 
end 

it "makes the player lie if a number between 5 and 6 is rolled" do 
    @game.stub(:roll).and_return(5) 
    @game.play 
    @player.token.should == @initial_token - 1 
end 
end 

我不断收到以下错误消息当我运行RSpec的文件：

失败：

1）游戏的进步，如果1和4之间的数卷 故障/错误的球员：@game。在'

2）游戏 未定义的方法-' for nil:NilClass # ./player.rb:19:in谎言 ' ＃./game.rb:24:in block in play' # ./game.rb:16:in每个' ＃./game.rb:16:in play' # ./game_spec.rb:17:in块（2级）：播放 NoMethodError使th È玩家谎言如果图5和6之间的一个数被轧制 故障/错误：@ game.play NoMethodError： 未定义的方法+' for nil:NilClass # ./player.rb:15:in预先 ' ＃./game.rb:21:in block in play' # ./game.rb:16:in每个' ＃./game。 rb：16：play' # ./game_spec.rb:23:in block（2 levels）in'

所以错误信息指向Player类下的advance/lie方法，但我不知道我做了什么错误。另外请随时指出其他错误。非常感谢提前。

Answer 1

这不是全部问题，但它是a的问题。

你的第一个错误对我来说有点突出。 player.lie只有当卷是5或6时才被调用，但是你使用roll方法返回了3。或者是否？

roll是Die类的一种方法，但是您将@game作为Game类的一个实例。