Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\siscementerio\vendor\mobiledetect\mobiledetectlib\tests\BasicsTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\siscementerio\vendor\mobiledetect\mobiledetectlib\tests\BasicsTest.php on line 9