discount_10percent_rollback.php

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<?php
$salesRule = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(\Magento\SalesRule\Model\Rule::class);
$salesRuleId = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(\Magento\Framework\Registry::class)
    ->registry('Magento/Checkout/_file/discount_10percent');
$salesRule->load($salesRuleId);
$salesRule->delete();