Why Yii2-basic template functional test _bootstrap.php does nothing

Yii 2.0 General Discussions
1

  1. start a yii2-basic application template

  2. navigate to tests/codeception/functional/_bootstrap.php

inside this php file, there is only two line




<?php

new yii\web\Application(require(dirname(__DIR__) . '/config/functional.php'));

if I commented this line out, all functional test still pass :unsure: , that’s strange

my question is: what does this line do ?