Fatal error: Uncaught Error: Class 'Tests\TestCase' not found in D:\php\WWW\scakxafxfgc.cccf.net\vendor\topthink\think-helper\tests\StrTest.php:6 Stack trace: #0 {main} thrown in D:\php\WWW\scakxafxfgc.cccf.net\vendor\topthink\think-helper\tests\StrTest.php on line 6