cakephp/tests/test_app/TestApp/Model/Table/GroupsTable.php

<?php
/**
 * CakePHP(tm) Tests <http://book.cakephp.org/2.0/en/development/testing.html>
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @since         3.0.0
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */
namespace TestApp\Model\Table;

use Cake\ORM\Table;

/**
 * Article table class
 *
 */
class GroupsTable extends Table
{

    public function initialize(array $config)
    {
        $this->belongsToMany('Members');

        $this->hasMany('GroupsMembers', [
            'dependent' => true,
            'cascadeCallbacks' => true
        ]);
    }
}