Issue #3037218 by kim.pepper, dww, Mile23: run-tests.sh with --browser throws...

Issue #3037218 by kim.pepper, dww, Mile23:  run-tests.sh with --browser throws error Class 'FileSystemInterface' not found

core/scripts/run-tests.sh

@@ -13,6 +13,7 @@
 use Drupal\Core\Asset\AttachedAssets;
 use Drupal\Core\Database\Database;
 use Drupal\Core\File\Exception\FileException;
+use Drupal\Core\File\FileSystemInterface;
 use Drupal\Core\StreamWrapper\PublicStream;
 use Drupal\Core\Test\TestDatabase;
 use Drupal\Core\Test\TestRunnerKernel;