magento-test/app/code/Magento/SalesRule/etc/events.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_model_service_quote_submit_before">
        <observer name="salesrule" instance="Magento\SalesRule\Observer\AddSalesRuleNameToOrderObserver" />
    </event>
    <event name="magento_salesrule_api_data_ruleinterface_save_before">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\BeforeEntitySave" />
    </event>
    <event name="magento_salesrule_api_data_ruleinterface_save_after">
        <observer name="legacy_model_save" instance="Magento\Framework\EntityManager\Observer\AfterEntitySave" />
    </event>
    <event name="magento_salesrule_api_data_ruleinterface_delete_before">
        <observer name="legacy_model_delete" instance="Magento\Framework\EntityManager\Observer\BeforeEntityDelete" />
    </event>
    <event name="magento_salesrule_api_data_ruleinterface_delete_after">
        <observer name="legacy_model_delete" instance="Magento\Framework\EntityManager\Observer\AfterEntityDelete" />
    </event>
    <event name="magento_salesrule_api_data_ruleinterface_load_after">
        <observer name="legacy_model_load" instance="Magento\Framework\EntityManager\Observer\AfterEntityLoad" />
    </event>
    <event name="sales_order_customer_assign_after">
        <observer name="sales_order_assign_customer_after" instance="Magento\SalesRule\Observer\AssignCouponDataAfterOrderCustomerAssignObserver" />
    </event>
    <event name="sales_quote_address_collect_totals_before">
        <observer name="coupon_code_validation" instance="Magento\SalesRule\Observer\CouponCodeValidation" />
    </event>
    <event name="salesrule_rule_save_commit_after">
        <observer name="salesrule_quote_recollect_totals_on_disabled" instance="\Magento\SalesRule\Observer\RuleQuoteRecollectTotalsObserver" />
    </event>
    <event name="salesrule_rule_delete_commit_after">
        <observer name="salesrule_quote_recollect_totals_on_delete" instance="\Magento\SalesRule\Observer\RuleQuoteRecollectTotalsObserver" />
    </event>
    <event name="sales_quote_collect_totals_before">
        <observer name="salesrule_sales_quote_collect_totals_before" instance="\Magento\SalesRule\Observer\QuoteResetAppliedRulesObserver" />
    </event>
</config>