Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10csm\vendor\psy\psysh\test\ParserFactoryTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10csm\vendor\psy\psysh\test\ParserFactoryTest.php on line 20