Fatal error: Uncaught Error: Class "Illuminate\Foundation\Testing\TestCase" not found in D:\Apache24\www\xyx_mes\back\backstage-of-xinyaxuan-mes\tests\TestCase.php:7 Stack trace: #0 {main} thrown in D:\Apache24\www\xyx_mes\back\backstage-of-xinyaxuan-mes\tests\TestCase.php on line 7