/**
* Checks if the function throws exception.
* @param callable
* @param string class
* @param string message
* @return void
*/
public static function throws($function, $class, $message = NULL)
{
try {
call_user_func($function);
self::doFail('Expected exception');
} catch (Exception $e) {
Assert::exception($class, $message, $e);
}
}