Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/www/drupal8/test/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php:17
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/tests/Drupal/Tests/Component/Uuid/UuidTest.php on line 17