Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/alkhalaffamily/public_html/new_qasa/vendor/sebastian/diff/tests/ChunkTest.php:18 Stack trace: #0 {main} thrown in /home/alkhalaffamily/public_html/new_qasa/vendor/sebastian/diff/tests/ChunkTest.php on line 18