Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\RegnowSite\vendor\topthink\framework\tests\DbTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\RegnowSite\vendor\topthink\framework\tests\DbTest.php on line 14