Ensure phpmailer is loaded

Author: srtfisher

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v0.12.14 - 2025-03-04
+
+### Fixed
+
+- Ensure that `PHPMailer\PHPMailer\Exception` is properly loaded during unit tests
+	when installing WordPress.
+
 ## v0.12.13 - 2024-05-07
 
 ### Fixed

src/mantle/testing/doubles/class-mockphpmailer.php

@@ -9,6 +9,7 @@
 }
 
 require_once ABSPATH . '/wp-includes/PHPMailer/PHPMailer.php';
+require_once ABSPATH . '/wp-includes/PHPMailer/Exception.php';
 
 class MockPHPMailer extends \PHPMailer\PHPMailer\PHPMailer {
 	var $mock_sent = array();