Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\Apache24_x64\htdocs\__cms\vendor\symfony\mime\Tests\Part\DataPartTest.php:21 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\__cms\vendor\symfony\mime\Tests\Part\DataPartTest.php on line 21