Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in /home/expeditions/public_html/wp-content/plugins/wp-smushit/vendor/mixpanel/mixpanel-php/test/Base/MixpanelBaseProducerTest.php:3 Stack trace: #0 {main} thrown in /home/expeditions/public_html/wp-content/plugins/wp-smushit/vendor/mixpanel/mixpanel-php/test/Base/MixpanelBaseProducerTest.php on line 3