Fatal error: Uncaught Error: Class "Tests\AbstractTestCase" not found in C:\xampp\htdocs\r10ca\vendor\nesbot\carbon\tests\Carbon\Exceptions\InvalidTimeZoneExceptionTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\nesbot\carbon\tests\Carbon\Exceptions\InvalidTimeZoneExceptionTest.php on line 17