--- /dev/null
+<?php
+
+namespace Drupal\Tests\comment\Kernel\Migrate\d6;
+
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
+
+/**
+ * Upgrade comment variables to field.storage.node.comment.yml.
+ *
+ * @group migrate_drupal_6
+ */
+class MigrateCommentVariableFieldTest extends MigrateDrupal6TestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['comment', 'menu_ui'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->installConfig(['comment']);
+ $this->migrateContentTypes();
+ $this->executeMigrations(['d6_comment_type', 'd6_comment_field']);
+ }
+
+ /**
+ * Tests comment variables migrated into a field entity.
+ */
+ public function testCommentField() {
+ $this->assertTrue(is_object(FieldStorageConfig::load('node.comment')));
+ }
+
+}