EVOLUTION-MANAGER
Edit File: MimePartAcceptanceTest.php
<?php require_once 'swift_required.php'; require_once __DIR__.'/Mime/MimePartAcceptanceTest.php'; class Swift_MimePartAcceptanceTest extends Swift_Mime_MimePartAcceptanceTest { protected function createMimePart() { Swift_DependencyContainer::getInstance() ->register('properties.charset')->asValue(null); return new Swift_MimePart(); } }