Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\API\vendor\google\cloud\Core\src\Testing\Snippet\SnippetTestCase.php:33 Stack trace: #0 {main} thrown in C:\xampp\htdocs\API\vendor\google\cloud\Core\src\Testing\Snippet\SnippetTestCase.php on line 33