shared_examples_before_filter.rb

  shared_examples 'included before filter' do |expected_filter, actions|
    controller do
      skip_filter *_process_action_callbacks.map(&:filter).reject {|filter| filter == expected_filter }

      actions.each do |action|
        define_method(action) do
          render nothing: true
        end
      end
    end

    before do
      controller_route = described_class.name.underscore.gsub('_controller', '')
      routes.draw do
        actions.each do |action|
          get action.to_s => "#{controller_route}##{action}"
        end
      end
    end

    actions.each do |action|
      it "action #{action} has '#{expected_filter}' as before filter" do
        expect(controller).to receive(expected_filter)
        get action
      end
    end
  end


  it_should_behave_like "included before filter", :render_pretty?, [:show, :index]