Fatal error: Uncaught Error: Class 'WP_UnitTestCase' not found in /home/afrikan/public_html/wp-content/plugins/imagify/vendor/deliciousbrains/wp-background-processing/tests/Test_Setup.php:11 Stack trace: #0 {main} thrown in /home/afrikan/public_html/wp-content/plugins/imagify/vendor/deliciousbrains/wp-background-processing/tests/Test_Setup.php on line 11