Fix RoutePareser#routes and add spec for it

rswag-specs/lib/rswag/route_parser.rb

@@ -11,7 +11,7 @@ module Rswag
     def routes
       ::Rails.application.routes.routes.select do |route|
         route.defaults[:controller] == controller
-      end.each_with_object({}) do |tree, route|
+      end.each_with_object({}) do |route, tree|
         path = path_from(route)
         verb = verb_from(route)
         tree[path] ||= { params: params_from(route), actions: {} }