Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\demo_old\vendor\khaled.alshamaa\ar-php\tests\ArabicTest.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\demo_old\vendor\khaled.alshamaa\ar-php\tests\ArabicTest.php on line 7