Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/lidia/vendor/google/auth/tests/Credentials/IAMCredentialsTest.php:23 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/google/auth/tests/Credentials/IAMCredentialsTest.php on line 23