--- /dev/null
+<?php
+
+namespace Drupal\Tests\migrate_drupal\Kernel\d6;
+
+use Drupal\node\Entity\Node;
+use Drupal\Tests\node\Kernel\Migrate\d6\MigrateNodeTestBase;
+
+/**
+ * Tests follow-up migrations.
+ *
+ * @group migrate_drupal
+ */
+class FollowUpMigrationsTest extends MigrateNodeTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = [
+ 'content_translation',
+ 'language',
+ 'menu_ui',
+ // A requirement for d6_node_translation.
+ 'migrate_drupal_multilingual',
+ ];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->executeMigrations([
+ 'language',
+ 'd6_language_content_settings',
+ 'd6_node',
+ 'd6_node_translation',
+ ]);
+ }
+
+ /**
+ * Test entity reference translations.
+ */
+ public function testEntityReferenceTranslations() {
+ // Test the entity reference field before the follow-up migrations.
+ $node = Node::load(10);
+ $this->assertSame('13', $node->get('field_reference')->target_id);
+ $this->assertSame('13', $node->get('field_reference_2')->target_id);
+ $translation = $node->getTranslation('fr');
+ $this->assertSame('20', $translation->get('field_reference')->target_id);
+ $this->assertSame('20', $translation->get('field_reference_2')->target_id);
+
+ $node = Node::load(12)->getTranslation('en');
+ $this->assertSame('10', $node->get('field_reference')->target_id);
+ $this->assertSame('10', $node->get('field_reference_2')->target_id);
+ $translation = $node->getTranslation('fr');
+ $this->assertSame('11', $translation->get('field_reference')->target_id);
+ $this->assertSame('11', $translation->get('field_reference_2')->target_id);
+
+ // Run the follow-up migrations.
+ $migration_plugin_manager = $this->container->get('plugin.manager.migration');
+ $migration_plugin_manager->clearCachedDefinitions();
+ $follow_up_migrations = $migration_plugin_manager->createInstances('d6_entity_reference_translation');
+ $this->executeMigrations(array_keys($follow_up_migrations));
+
+ // Test the entity reference field after the follow-up migrations.
+ $node = Node::load(10);
+ $this->assertSame('12', $node->get('field_reference')->target_id);
+ $this->assertSame('12', $node->get('field_reference_2')->target_id);
+ $translation = $node->getTranslation('fr');
+ $this->assertSame('12', $translation->get('field_reference')->target_id);
+ $this->assertSame('12', $translation->get('field_reference_2')->target_id);
+
+ $node = Node::load(12)->getTranslation('en');
+ $this->assertSame('10', $node->get('field_reference')->target_id);
+ $this->assertSame('10', $node->get('field_reference_2')->target_id);
+ $translation = $node->getTranslation('fr');
+ $this->assertSame('10', $translation->get('field_reference')->target_id);
+ $this->assertSame('10', $translation->get('field_reference_2')->target_id);
+ }
+
+}