Fatal error: Uncaught Error: Class 'Google\Auth\Tests\BaseTest' not found in /var/www/html/composer/vendor/google/auth/tests/HttpHandler/Guzzle6HttpHandlerTest.php:29 Stack trace: #0 {main} thrown in /var/www/html/composer/vendor/google/auth/tests/HttpHandler/Guzzle6HttpHandlerTest.php on line 29