Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/interweavesoluti/desktop.interweavesolutions.org/vendor/jms/serializer/tests/Handler/IteratorHandlerTest.php:16 Stack trace: #0 {main} thrown in /home/interweavesoluti/desktop.interweavesolutions.org/vendor/jms/serializer/tests/Handler/IteratorHandlerTest.php on line 16