Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print-bk\vendor\psy\psysh\test\TabCompletion\AutoCompleterTest.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\psy\psysh\test\TabCompletion\AutoCompleterTest.php on line 21