Fatal error: Uncaught Error: Class 'WP_UnitTestCase' not found in /home/wemmbca/public_html/wp-content/plugins/event-calendar-newsletter/tests/TheEventsCalendarTest.php:3 Stack trace: #0 {main} thrown in /home/wemmbca/public_html/wp-content/plugins/event-calendar-newsletter/tests/TheEventsCalendarTest.php on line 3