Add routing to StatisticsController

config/routes.rb

@@ -8,6 +8,8 @@ Rails.application.routes.draw do
 
   resources :matches, only: %i[show update]
   resources :teams, only: %i[show update]
-  resources :tournaments
+  resources :tournaments do
+    resources :statistics, only: %i[index]
+  end
   resources :match_scores, only: %i[show update]
 end

spec/routing/statistics_routing_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe StatisticsController, type: :routing do
+  describe 'routing' do
+    it 'routes to #index' do
+      expect(get: '/tournaments/1/statistics').to route_to('statistics#index', tournament_id: '1')
+    end
+  end
+end