Around('@stub_facebook') do |scenario, block|
  class OmniAuth::Builder
    alias_method :orig_call, :call
    def call(env)
      TestOmniAuth.new(@app).call(env)
    end
  end

  #for some reason this doesn't work
  Rails.application.config.middleware.swap OmniAuth::Builder, TestOmniAuth
  block.call

  class OmniAuth::Builder
    alias_method :call, :orig_call
  end
end