--- /dev/null
+<?php
+
+namespace Drupal\Tests\forum\Kernel\Migrate\d6;
+
+use Drupal\Tests\SchemaCheckTestTrait;
+use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
+
+/**
+ * Upgrade variables to forum.settings.yml.
+ *
+ * @group migrate_drupal_6
+ */
+class MigrateForumConfigsTest extends MigrateDrupal6TestBase {
+
+ use SchemaCheckTestTrait;
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['comment', 'forum', 'taxonomy'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->executeMigration('d6_taxonomy_vocabulary');
+ $this->executeMigration('d6_forum_settings');
+ }
+
+ /**
+ * Tests migration of forum variables to forum.settings.yml.
+ */
+ public function testForumSettings() {
+ $config = $this->config('forum.settings');
+ $this->assertIdentical(15, $config->get('topics.hot_threshold'));
+ $this->assertIdentical(25, $config->get('topics.page_limit'));
+ $this->assertIdentical(1, $config->get('topics.order'));
+ $this->assertIdentical('vocabulary_1_i_0_', $config->get('vocabulary'));
+ // This is 'forum_block_num_0' in D6, but block:active:limit' in D8.
+ $this->assertSame(3, $config->get('block.active.limit'));
+ // This is 'forum_block_num_1' in D6, but 'block:new:limit' in D8.
+ $this->assertSame(4, $config->get('block.new.limit'));
+ $this->assertConfigSchema(\Drupal::service('config.typed'), 'forum.settings', $config->get());
+ }
+
+}