How to re enable logging during unit testing

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defined('YII_DEBUG') or define('YII_DEBUG',true);
defined('YII_TRACE_LEVEL') or define('YII_TRACE_LEVEL', 3);

require_once($yiit);
//require_once(dirname(__FILE__).'/WebTestCase.php');

Yii::createWebApplication($config);
// automatically send every new message to available log routes
Yii::getLogger()->autoFlush = 1;
// when sending a message to log routes, also notify them to dump the message
[...]