Action controller callbacks rspec matchers

action_controller_callbacks_matchers

RSpec::Matchers.define :use_before_action do |expected|

  # @example
  #   expect { get :index }.to use_before_action(:authenticate_user!)
  match do |actual|
    expect(controller).to receive(expected).and_call_original

    instance_exec &actual

    described_class._process_action_callbacks.find do |callback|
      callback.filter == expected
    end.kind == :before
  end

  supports_block_expectations
end