Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\rhis-portal\vendor\sebastian\comparator\tests\DOMNodeComparatorTest.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\rhis-portal\vendor\sebastian\comparator\tests\DOMNodeComparatorTest.php on line 23