Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\RegnowSite\vendor\topthink\think-container\tests\ContainerTest.php:79 Stack trace: #0 {main} thrown in C:\xampp\htdocs\RegnowSite\vendor\topthink\think-container\tests\ContainerTest.php on line 79