added simplecov for test coverge report

config/environments/test.rb

@@ -39,4 +39,8 @@ Rails.application.configure do
 
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
+
+  # Disable Rails's static asset server (Apache or nginx will already do this)
+  config.public_file_server.enabled = false
+  config.eager_load = false
 end