Override Ability class in SystemTests?

[barriault]

Is there a way to override the Ability class and inject a new one for system testing? I'd like to be able to inject two different files depending on what I'm doing.

can :manage, :all

or

cannot :manage, :all

Then I can run my system tests without worrying about slow tests because most of my abilities are in the database, and they are already tested elsewhere. Plus I really don't want to set all that up in fixtures. I just want system level tests where I can test authentication and authorization, and make sure the views are rendering what I expect.

[barriault]

Well, I figured it out. Here is what I did if anyone is interested.

require 'application_system_test_case'
require 'minitest-matchers'

class AdminAdditionalCoveragesTest < ApplicationSystemTestCase
  driven_by :selenium, using: :headless_chrome
  
  class CanAbility
    include CanCan::Ability
    def initialize(current_user)
      can :manage, :all
    end
  end
  
  class CannotAbility
    include CanCan::Ability
    def initialize(current_user)
      cannot :manage, :all
    end
  end
  
  
  test 'authorized index' do
    # authenticated and authorized
    user = users(:user)
    sign_in user
    
    Admin::ApplicationController.class_eval do
      def current_ability
        @current_ability = CanAbility.new(current_user)
      end
    end
    
    visit admin_additional_coverages_url
    
    assert_selector '.container-fluid'
    assert_selector '.page-header', text: 'Additional Coverage'
  end
  
  test 'unauthorized index' do
    # authenticated but unauthorized
    user = users(:user)
    sign_in user
    
    Admin::ApplicationController.class_eval do
      def current_ability
        @current_ability = CannotAbility.new(current_user)
      end
    end
    
    visit admin_additional_coverages_url
    
    assert_selector '.container-fluid'
    assert_selector '#flash_alert', text: 'You are not authorized to access this page.'
  end
  
end