recycle!

# File actionpack/lib/action_controller/test_case.rb, line 251
    def recycle!
      @formats = nil
      @env.delete_if { |k, v| k =~ /^(action_dispatch|rack)\.request/ }
      @env.delete_if { |k, v| k =~ /^action_dispatch\.rescue/ }
      @method = @request_method = nil
      @fullpath = @ip = @remote_ip = @protocol = nil
      @env['action_dispatch.request.query_parameters'] = {}
      @set_cookies ||= {}
      @set_cookies.update(Hash[cookie_jar.instance_variable_get("@set_cookies").map{ |k,o| [k,o[:value]] }])
      deleted_cookies = cookie_jar.instance_variable_get("@delete_cookies")
      @set_cookies.reject!{ |k,v| deleted_cookies.include?(k) }
      cookie_jar.update(rack_cookies)
      cookie_jar.update(cookies)
      cookie_jar.update(@set_cookies)
      cookie_jar.recycle!
    end