Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDi\vendor\pvc\regex\tests\unicode\RegexAlphabeticTest.php:15 Stack trace: #0 {main} thrown in I:\www\pvcDi\vendor\pvc\regex\tests\unicode\RegexAlphabeticTest.php on line 15