Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/interweavesoluti/desktop.interweavesolutions.org/vendor/jms/serializer/tests/Serializer/ContextTest.php:19 Stack trace: #0 {main} thrown in /home/interweavesoluti/desktop.interweavesolutions.org/vendor/jms/serializer/tests/Serializer/ContextTest.php on line 19