Fatal error: Uncaught Error: Class "Behat\Mink\Driver\Selenium2Driver" not found in /home/www/drupal8/test/core/tests/Drupal/FunctionalJavascriptTests/DrupalSelenium2Driver.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/FunctionalJavascriptTests/DrupalSelenium2Driver.php on line 11