Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/composer/vendor/google/auth/tests/Credentials/AppIdentityCredentialsTest.php:32 Stack trace: #0 {main} thrown in /var/www/html/composer/vendor/google/auth/tests/Credentials/AppIdentityCredentialsTest.php on line 32