First commit

sites/all/modules/civicrm/Civi/Test/TransactionalInterface.php

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+<?php
+
+namespace Civi\Test;
+
+/**
+ * Interface HeadlessInterface
+ * @package Civi\Test
+ *
+ * Mark a test with TransactionalInterface to instruct CiviTestListener to wrap
+ * each test in a transaction (and rollback).
+ *
+ * Note: At time of writing, CiviTestListener only supports using TransactionalInterface if
+ * the test is in-process and runs with CIVICRM_UF==UnitTests.
+ *
+ * For end-to-end testing, it is expected that the CMS will not participate in the transaction,
+ * so the transaction mechanism will not work.
+ *
+ * @see HeadlessInterface
+ */
+interface TransactionalInterface {
+
+}