<?php
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

/** @var \Magento\Framework\Registry $registry */
$registry = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get('Magento\Framework\Registry');
$registry->unregister('isSecureArea');
$registry->register('isSecureArea', true);

/** @var $customer \Magento\Customer\Model\Customer*/
$customer = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create('Magento\Customer\Model\Customer');
$customer->load(1);
if ($customer->getId()) {
    $customer->delete();
}

$registry->unregister('isSecureArea');
$registry->register('isSecureArea', false);
