Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestSuite" not found in /home/www/drupal8/test/core/tests/TestSuites/TestSuiteBase.php:11 Stack trace: #0 /home/www/drupal8/test/core/tests/TestSuites/UnitTestSuite.php(5): require_once() #1 {main} thrown in /home/www/drupal8/test/core/tests/TestSuites/TestSuiteBase.php on line 11