For passing the test using "redirect_to"  in before_filter

When using "redirect_to :root"  in before_filter, the rspec test occurs ActionController::RoutingError exception.

In order to pass the test, change methods _routes to route at controller_example_group.rb.

My modification might not meet the views of "https://github.com/rspec/rspec-rails/commit/648ba097eced24f5bbf70dd0d97b02ad6464f19e".