--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests the update path with a broken router.
+ *
+ * @group Update
+ */
+class UpdatePathWithBrokenRoutingTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../tests/fixtures/update/drupal-8.bare.standard.php.gz',
+ __DIR__ . '/../../../../tests/fixtures/update/drupal-8.broken_routing.php',
+ ];
+ }
+
+ /**
+ * Tests running update.php with some form of broken routing.
+ */
+ public function testWithBrokenRouting() {
+ // Simulate a broken router, and make sure the front page is
+ // inaccessible.
+ \Drupal::state()->set('update_script_test_broken_inbound', TRUE);
+ \Drupal::service('cache_tags.invalidator')->invalidateTags(['route_match', 'rendered']);
+ $this->drupalGet('<front>');
+ $this->assertResponse(500);
+
+ $this->runUpdates();
+
+ // Remove the simulation of the broken router, and make sure we can get to
+ // the front page again.
+ \Drupal::state()->set('update_script_test_broken_inbound', FALSE);
+ $this->drupalGet('<front>');
+ $this->assertResponse(200);
+ }
+
+}