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I am testing CanCan abilities for the first time and am stumped. I'm missing something...even if I return false/true inside of the can :invite_to block I am still not getting passing specs. Am I missing using the CanCan matchers? or stubs? or definiing abilities in CanCan?

Anything I'm missing?

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

Failures

  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)>'
Eric M.
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1 Answers1

5
  let(:network) do 
    n = Network.new
    n.stub!(:allows_invitations? => true)
    n
  end

If you run the code as you wrote it, the code inside the Can block is never reached. Your call to stub returns an object of class RSpec::Mocks::Mock; it must be of class Network for CanCan to apply the rule.

bdon
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  • Excellent catch. I just read that part in the documentation about it skipping the block when a class is given instead of an instance. It didn't click, though. Thanks. – Eric M. Feb 16 '12 at 14:01