Rails 初学者使用 CanCan 测试 RSpec 的问题

Question

我目前正在使用 cancan 和 rspec。

请看看我的ability.rb

require 'spec_helper'
require "cancan/matchers"

class Ability

  include CanCan::Ability

  def initialize(user)
    if user       # Only logged in users
      if user.role? :admin
        can :manage, :all

      elsif user.role? :producer
        can :read, Business
        can :update, Business do |b|
          b.user_id == user.id
        end
        can :redeem, Purchase 

      elsif user.role? :consumer
        can :your, Deal
        can [:create, :redirect_to_wepay], Purchase
        can :show, Purchase do |purchase|
          purchase.user_id == user.id
        end
      end

      # Good thing about devise with Cancan is that it takes care of this.
      can :manage, User do |the_user|
        the_user.id == user.id
      end

    else
      # This is needed for the cans that follows
      user = User.new

    end

    # Everyone's session
    can :read, Deal
    can :read, Business

    # You have to enable it for wepay
    can [:sold_out, :callback, :received], Purchase

  end
end

在我的spec/models/ability_spec.rb 中，我有

describe Ability do 

  describe "consumers" do
    describe "cancan" do 
      before(:each) do
        @user = Factory(:user, :role => "consumer")
        @ability = Ability.new(@user)
      end

      describe "success" do 
        #**This line I am getting ability is nil
        @ability.should == 5

        #**This line gives me be_able_to undefined
        #@ability.should_not be_able_to(:read, Factory(:deal))

        #@ability.can(:read, Factory(:business)).should be_true
      end

任何想法为什么我将@ability 设为nil？

另外，我想将我的控制器的一些与权限控制相关的操作放在这个ability_spec.rb文件中。这可能吗？ （我明确希望实现这一目标，因为我的应用程序有 3 个用户角色，而且我发现自己在控制器规范文件中乱扔了所有这些与权限相关的衬里。

谢谢！

Answer 1

测试必须出现在 it 或 specify 块中。 describe 和 context 只是用于分组。

describe "success" do 
  #**This line I am getting ability is nil
  @ability.should == 5
end

应该更像是：

it "allows consumers to do blah blah blah" do 
  @ability.should == 5
end