Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDisplay\vendor\pvc\regex\tests\filename\RegexWindowsFilenameTest.php:18 Stack trace: #0 {main} thrown in I:\www\pvcDisplay\vendor\pvc\regex\tests\filename\RegexWindowsFilenameTest.php on line 18