Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\adminlte3\vendor\symfony\translation\Test 2\ProviderTestCase.php:31 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\symfony\translation\Test 2\ProviderTestCase.php on line 31