Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\finance\vendor\kalnoy\nestedset\tests\ScopedNodeTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\finance\vendor\kalnoy\nestedset\tests\ScopedNodeTest.php on line 6