Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Tests/Encoder/ChainEncoderTest.php:19 Stack trace: #0 {main} thrown in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/serializer/Tests/Encoder/ChainEncoderTest.php on line 19