Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\admin\vendor\psr\log\Psr\Log\Test\LoggerInterfaceTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\psr\log\Psr\Log\Test\LoggerInterfaceTest.php on line 15