Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Apache24\www\qilu_sap\back-end\vendor\mobiledetect\mobiledetectlib\tests\UserAgentTest.php:9 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu_sap\back-end\vendor\mobiledetect\mobiledetectlib\tests\UserAgentTest.php on line 9