--- /dev/null
+<?php
+
+namespace Drupal\help_test;
+
+use Drupal\Core\Routing\UrlGeneratorInterface;
+use Symfony\Component\Routing\RequestContext;
+
+/**
+ * Implements a URL generator which always thrown an exception.
+ */
+class SupernovaGenerator implements UrlGeneratorInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setContext(RequestContext $context) {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getContext() {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function generate($name, $parameters = [], $referenceType = self::ABSOLUTE_PATH) {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getPathFromRoute($name, $parameters = []) {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function generateFromRoute($name, $parameters = [], $options = [], $collect_bubbleable_metadata = FALSE) {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function supports($name) {
+ throw new \Exception();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getRouteDebugMessage($name, array $parameters = []) {
+ throw new \Exception();
+ }
+
+}