--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests system_update_8002().
+ *
+ * @group Update
+ */
+class RouterIndexOptimizationTest extends UpdatePathTestBase {
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../tests/fixtures/update/drupal-8.bare.standard.php.gz',
+ ];
+ }
+
+ /**
+ * Ensures that the system_update_8002() runs as expected.
+ */
+ public function testUpdate() {
+ $this->runUpdates();
+ $database = $this->container->get('database');
+ // Removed index.
+ $this->assertFalse($database->schema()->indexExists(
+ 'router', 'pattern_outline_fit'
+ ));
+ // Added index.
+ $this->assertTrue($database->schema()->indexExists(
+ 'router', 'pattern_outline_parts'
+ ));
+ }
+
+}