Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\SoftlibSite\vendor\topthink\framework\tests\SessionTest.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\SoftlibSite\vendor\topthink\framework\tests\SessionTest.php on line 19