View spec helper for CanCanCommunity/cancancan

authentication.rb

# spec/support/authentication.rb

# Enable can? method in view specs for cancancan gem
#
# Example:
# 
# ```
# let(:admin) { Fabricate(:user_admin) }
# before { enable_can(view, admin) }
# ```

module TestHelpers
  module Authentication
    # set the current_user
    def enable_can(view, user)
      without_partial_double_verification do
        allow(view).to receive(:can?) do |action, record|
          ability = Ability.new(user)
          ability.can?(action, record)
        end
        allow(view).to receive(:current_user) { user }
      end
    end
    
    # setup a guest user for devise
    def enable_devise_user(view)
      without_partial_double_verification do
        allow(view).to receive(:resource) { User.new }
        allow(view).to receive(:resource_class) { User }
        allow(view).to receive(:resource_name) { :user }
        allow(view).to receive(:devise_mapping) { Devise.mappings[:user] }
      end
    end
  end
end

authorization.rb

# spec/support/authorizaton.rb

module TestHelpers
  module Authorization
    def expect_to_be_unauthorized(response)
      expect(response).to redirect_to(:unauthorized)
    end

    def enable_devise_user(controller, user = nil)
      without_partial_double_verification do
        @request.env['devise.mapping'] = Devise.mappings[:user]
        allow(controller).to receive(:resource) { user } if user
      end
    end
  end
end

rails_helper.rb

# spec/rails_helper.rb

..
  
Dir[Rails.root.join('spec/support/**/*.rb')].sort.each { |f| require f }

RSpec.configure do |config|
  ..
  config.include TestHelpers::Authentication, type: :view
  config.include TestHelpers::Authorization, type: :controller
end