Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/luxurytr/public_html/lt8/vendor/google/auth/tests/Credentials/UserRefreshCredentialsTest.php:37 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/google/auth/tests/Credentials/UserRefreshCredentialsTest.php on line 37