Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\symfony\translation\Tests\Dumper\CsvFileDumperTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\symfony\translation\Tests\Dumper\CsvFileDumperTest.php on line 18