如何正確使用RSpec測試CanCan能力

Question

我正在首次測試CanCan能力，並且難住了。我錯過了一些東西......即使我在罐頭裏面返回false/true：invite_to block，我仍然沒有通過規格。我錯過了使用CanCan匹配器嗎？或存根？或在CanCan中定義能力？

我錯過了什麼？

ability.rb

class Ability 
    include CanCan::Ability 

    def initialize(user) 
    user ||= User.new 

    can :invite_to, Network do |network| 
     network.allows_invitations? && (user.admin? || user.can_send_invitations_for?(network)) 
    end 
    end 
end 

ability_spec.rb

require 'cancan' 
require 'cancan/matchers' 
require_relative '../../app/models/ability.rb' 

class Network; end; 

describe Ability do 
    let(:ability) { Ability.new(@user) } 

    describe "#invite_to, Network" do 
    context "when network level invitations are enabled" do 
     let(:network) { stub(allows_invitations?: true) } 

     it "allows an admin" do 
     @user = stub(admin?: true) 
     ability.should be_able_to(:invite_to, network) 
     end 

     it "allows a member if the member's invitation privileges are enabled" do 
     @user = stub(admin?: false, can_send_invitations_for?: true) 
     ability.should be_able_to(:invite_to, network) 
     end 

     it "denies a member if the member's invitation privileges are disabled" do 
     @user = stub(admin?: false, can_send_invitations_for?: false) 
     ability.should_not be_able_to(:invite_to, network) 
     end 
    end 
    end 
end 

故障

1) Ability#invite_to, Network when network level invitations are enabled allows an admin 
    Failure/Error: ability.should be_able_to(:invite_to, network) 
     expected to be able to :invite_to #<RSpec::Mocks::Mock:0x3fe3ed90444c @name=nil> 
    # ./spec/models/ability_spec.rb:16:in `block (4 levels) in <top (required)>' 

    2) Ability#invite_to, Network when network level invitations are enabled allows a member if the member's invitation privileges are enabled 
    Failure/Error: ability.should be_able_to(:invite_to, network) 
     expected to be able to :invite_to #<RSpec::Mocks::Mock:0x3fe3edc27408 @name=nil> 
    # ./spec/models/ability_spec.rb:21:in `block (4 levels) in <top (required)>' 

Answer 1

let(:network) do 
    n = Network.new 
    n.stub!(:allows_invitations? => true) 
    n 
    end 

如果您在編寫代碼時運行代碼，Can塊內的代碼永遠不會到達。你對存根的調用返回一個RSpec :: Mocks :: Mock類的對象;它必須是CanCan的網絡類才能應用該規則。