Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDisplay\vendor\pvc\regex\tests\numeric\RegexPositiveIntegerSimpleTest.php:13 Stack trace: #0 {main} thrown in I:\www\pvcDisplay\vendor\pvc\regex\tests\numeric\RegexPositiveIntegerSimpleTest.php on line 13