Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\fiveplus\vendor\sebastian\comparator\tests\DateTimeComparatorTest.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fiveplus\vendor\sebastian\comparator\tests\DateTimeComparatorTest.php on line 25