pp_cms/webApp/backend/fixtures/UserFixture.php

<?php

/**
 * Author: lf
 * Blog: https://blog.feehi.com
 * Email: job@feehi.com
 * Created at: 2017-08-24 21:52
 */
namespace backend\fixtures;

use yii\test\ActiveFixture;

class UserFixture extends ActiveFixture
{
    public $modelClass = 'common\models\AdminUser';
}