Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/app-root/src/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-list/tests/php/test-post-thumbnail.php:19 Stack trace: #0 {main} thrown in /opt/app-root/src/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-post-list/tests/php/test-post-thumbnail.php on line 19