Fatal error: Uncaught Error: Class "WP_UnitTestCase" not found in /opt/app-root/src/wp-content/plugins/ewww-image-optimizer/tests/test-utility.php:12 Stack trace: #0 {main} thrown in /opt/app-root/src/wp-content/plugins/ewww-image-optimizer/tests/test-utility.php on line 12