Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\vendor\phar-io\manifest\tests\ManifestDocumentMapperTest.php:45 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\phar-io\manifest\tests\ManifestDocumentMapperTest.php on line 45