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