Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/oyaagyug/public_html/vendor/kalnoy/nestedset/tests/ScopedNodeTest.php:6 Stack trace: #0 {main} thrown in /home/oyaagyug/public_html/vendor/kalnoy/nestedset/tests/ScopedNodeTest.php on line 6