Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/aperioa/test/admin/vendor/symfony/http-kernel/Tests/CacheClearer/Psr6CacheClearerTest.php:18 Stack trace: #0 {main} thrown in /home/aperioa/test/admin/vendor/symfony/http-kernel/Tests/CacheClearer/Psr6CacheClearerTest.php on line 18