Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\xampp\htdocs\SSWPOS\vendor\google\cloud-core\tests\Unit\RestTraitTest.php:36 Stack trace: #0 {main} thrown in D:\xampp\htdocs\SSWPOS\vendor\google\cloud-core\tests\Unit\RestTraitTest.php on line 36