--- /dev/null
+<?php
+
+namespace Drupal\Tests\syslog\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests that syslog settings are properly updated during database updates.
+ *
+ * @group syslog
+ */
+class SyslogUpdateTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-8.filled.standard.php.gz',
+ ];
+ }
+
+ /**
+ * Tests that syslog.settings.facility has been converted from string to int.
+ *
+ * @see syslog_update_8400()
+ */
+ public function testSyslogSettingsFacilityDataType() {
+ $config = $this->config('syslog.settings');
+ $this->assertIdentical('128', $config->get('facility'));
+
+ // Run updates.
+ $this->runUpdates();
+
+ $config = $this->config('syslog.settings');
+ $this->assertIdentical(128, $config->get('facility'));
+ }
+
+}