--- /dev/null
+<?php
+
+namespace Drupal\Tests\comment\Functional\Update;
+
+use Drupal\comment\Entity\Comment;
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests that comment hostname settings are properly updated.
+ *
+ * @group comment
+ * @group legacy
+ */
+class CommentHostnameUpdateTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-8-rc1.bare.standard.php.gz',
+ ];
+ }
+
+ /**
+ * Tests comment_update_8600().
+ *
+ * @see comment_update_8600
+ */
+ public function testCommentUpdate8600() {
+ /** @var \Drupal\Core\Entity\EntityDefinitionUpdateManagerInterface $manager */
+ $manager = $this->container->get('entity.definition_update_manager');
+
+ /** @var \Drupal\Core\Field\BaseFieldDefinition $definition */
+ $definition = $manager->getFieldStorageDefinition('hostname', 'comment');
+ // Check that 'hostname' base field doesn't have a default value callback.
+ $this->assertNull($definition->getDefaultValueCallback());
+
+ $this->runUpdates();
+
+ $definition = $manager->getFieldStorageDefinition('hostname', 'comment');
+ // Check that 'hostname' base field default value callback was set.
+ $this->assertEquals(Comment::class . '::getDefaultHostname', $definition->getDefaultValueCallback());
+ }
+
+}