--- /dev/null
+<?php
+
+namespace Drupal\Tests\migrate_drupal\Kernel;
+
+use Drupal\migrate_field_plugin_manager_test\Plugin\migrate\cckfield\d6\FileField;
+use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
+
+/**
+ * @group migrate_drupal
+ */
+class CckFieldBackwardsCompatibilityTest extends MigrateDrupal6TestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['file', 'migrate_field_plugin_manager_test'];
+
+ /**
+ * Ensures that the cckfield backwards compatibility layer is invoked.
+ */
+ public function testBackwardsCompatibility() {
+ $migration = $this->container
+ ->get('plugin.manager.migration')
+ ->getDefinition('d6_node:story');
+
+ $this->assertSame(FileField::class, $migration['process']['field_test_filefield']['class']);
+ }
+
+}