Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print-bk\vendor\phar-io\version\tests\Integration\VersionConstraintParserTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\phar-io\version\tests\Integration\VersionConstraintParserTest.php on line 18