Fatal error: Uncaught Error: Class "Drupal\KernelTests\KernelTestBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/select2/tests/src/Kernel/Element/Select2Test.php:12 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/select2/tests/src/Kernel/Element/Select2Test.php on line 12