Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

spec/controllers/ping_controller_spec.rb

@@ -5,13 +5,13 @@ require 'rails_helper'
 RSpec.describe PingController do
   render_views
 
-  describe 'index' do
-    before { allow(Runner.strategy_class).to receive(:health).and_return(true) }
-
-    it 'returns the wanted page and answer with HTTP Status 200' do
+  describe 'GET #index' do
+    before do
+      allow(Runner.strategy_class).to receive(:health).and_return(true)
       get :index
-
-      expect(response).to have_http_status :ok
     end
+
+    expect_json
+    expect_http_status(:ok)
   end
 end