What is messageTest?!

in page 49 of this book i have a problem with understanding that why we should use this line to call the class ?!

$message = new MessageController('messageTest');

in this function :

public function testRepeat()


$message = new MessageController('messageTest');

$yell = "Hello, Any One Out There?";

$returnedMessage = $message->repeat($yell);

$this->assertEquals($returnedMessage, $yell);


why should use the ‘messageTest’ ?

what is this?!? :D

sorry for my bad English :D


‘messageTest’ is id of the controller, please check:

CController::__construct() method, it accept parameter $id.