Fatal error: Uncaught Error: Class "WP_UnitTestCase" not found in /home/successforkids/public_html/wp-content/plugins/yith-woocommerce-pre-order-premium/plugin-fw/tests/unit-tests/class-yith-plugin-fw-tests-plugin-panel-wc.php:11 Stack trace: #0 {main} thrown in /home/successforkids/public_html/wp-content/plugins/yith-woocommerce-pre-order-premium/plugin-fw/tests/unit-tests/class-yith-plugin-fw-tests-plugin-panel-wc.php on line 11