Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\hoteline\vendor\symfony\mime\Tests\Crypto\DkimSignerTest.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hoteline\vendor\symfony\mime\Tests\Crypto\DkimSignerTest.php on line 26