public function testListAddressBooks()
 {
     $addressBooks = $this->object->ListAddressBooks();
     $addressBook = array_pop($addressBooks);
     $this->assertRegExp('/\\d*?/', (string) $addressBook->ID);
     $this->assertRegExp('/[a-zA-Z0-9 ]*?/', $addressBook->Name);
 }
<?php

use Philipnorton42\DotMailer\DotMailer;
require_once __DIR__ . '/../vendor/autoload.php';
try {
    $dotmailer = new DotMailer('', '');
} catch (\Exception $e) {
    die('DotMailer class not found' . PHP_EOL);
}
$addressBooks = $dotmailer->ListAddressBooks();
foreach ($addressBooks as $book) {
    print $book->ID . ' => ' . $book->Name . PHP_EOL;
}