Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\CnVideosSite\vendor\topthink\think-template\tests\think\TemplateTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\CnVideosSite\vendor\topthink\think-template\tests\think\TemplateTest.php on line 8