Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\ApiSigestWin\1.20.01.20.4\vendor\symfony\serializer\Tests\Mapping\ClassDiscriminatorMappingTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.20.01.20.4\vendor\symfony\serializer\Tests\Mapping\ClassDiscriminatorMappingTest.php on line 22