workaround.rb

require 'spec_helper'

module CanCan
  class AccessDenied < Exception; end
end

describe "StaticPages" do
  before :each do
    def @this.do_create
      # …
      fail CanCan::AccessDenied.new
    end
  end

  shared_examples "an access controlled action" do |action_proc|
    it "denies access if the post is not verified" do
      expect(&action_proc).to raise_error(CanCan::AccessDenied)
    end
  end

  describe "#create" do
    it_behaves_like "an access controlled action", proc { @this.do_create }
  end

end