--- /dev/null
+<?php
+
+namespace Drupal\Tests\forum\Kernel\Migrate\d6;
+
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
+use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\node\Entity\Node;
+use Drupal\Tests\node\Kernel\Migrate\d6\MigrateNodeTestBase;
+
+/**
+ * Tests forum migration from Drupal 6 to Drupal 8.
+ *
+ * @group migrate_drupal_6
+ */
+class MigrateForumTest extends MigrateNodeTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = [
+ 'comment',
+ 'forum',
+ 'menu_ui',
+ 'taxonomy',
+ ];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+
+ $this->installEntitySchema('comment');
+ $this->installSchema('comment', ['comment_entity_statistics']);
+ $this->installSchema('forum', ['forum', 'forum_index']);
+ $this->installConfig(['comment', 'forum']);
+ $this->migrateContent();
+ $this->migrateTaxonomy();
+ $this->executeMigrations([
+ 'd6_comment_type',
+ 'd6_comment_field',
+ 'd6_comment_field_instance',
+ 'd6_comment_entity_display',
+ 'd6_comment_entity_form_display',
+ 'd6_comment',
+ 'd6_term_node',
+ ]);
+ }
+
+ /**
+ * Tests forum migration.
+ */
+ public function testForumMigration() {
+ // Tests that the taxonomy_forums field storage config exists.
+ $field_storage_config = FieldStorageConfig::load('node.taxonomy_forums');
+ $this->assertInstanceOf(FieldStorageConfig::class, $field_storage_config);
+
+ // Tests that the taxonomy_forums field config exists.
+ $field_config = FieldConfig::load('node.forum.taxonomy_forums');
+ $this->assertInstanceOf(FieldConfig::class, $field_config);
+
+ // Tests that the taxonomy_forums entity view display component exists.
+ $entity_view_display = EntityViewDisplay::load('node.forum.default')->getComponent('taxonomy_forums');
+ $this->assertTrue(is_array($entity_view_display));
+
+ // Tests that the taxonomy_forums entity form display component exists.
+ $entity_form_display = EntityFormDisplay::load('node.forum.default')->getComponent('taxonomy_forums');
+ $this->assertTrue(is_array($entity_form_display));
+
+ // Test that the taxonomy_forums field has the right value.
+ $node = Node::load(19);
+ $this->assertEquals(8, $node->taxonomy_forums->target_id);
+ }
+
+}