customer_rollback.php

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

use Magento\Integration\Model\Oauth\Token\RequestThrottler;

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

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

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

/* Unlock account if it was locked for tokens retrieval */
/** @var RequestThrottler $throttler */
$throttler = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(RequestThrottler::class);
$throttler->resetAuthenticationFailuresCount('customer@example.com', RequestThrottler::USER_TYPE_CUSTOMER);