Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDom\tests\html\IntegrationTests\ValidatorHtmlDocumentIntegrationTest.php:9 Stack trace: #0 {main} thrown in I:\www\pvcDom\tests\html\IntegrationTests\ValidatorHtmlDocumentIntegrationTest.php on line 9