Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in C:\xampp\htdocs\arthurkotsch.online\vendor\cebe\markdown\tests\ParserTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\arthurkotsch.online\vendor\cebe\markdown\tests\ParserTest.php on line 18