--- /dev/null
+<?php
+
+namespace Drupal\Tests\field\Unit\Plugin\migrate\process;
+
+use Drupal\field\Plugin\migrate\process\FieldTypeDefaults;
+use Drupal\Tests\migrate\Unit\process\MigrateProcessTestCase;
+
+/**
+ * Tests the deprecation of the field_type_defaults process plugin.
+ *
+ * @coversDefaultClass \Drupal\field\Plugin\migrate\process\FieldTypeDefaults
+ * @group field
+ * @group legacy
+ */
+class FieldTypeDefaultsTest extends MigrateProcessTestCase {
+
+ /**
+ * Tests that the field_type_defaults plugin triggers a deprecation error.
+ *
+ * @expectedDeprecation The field_type_defaults process plugin is deprecated in Drupal 8.6.0 and will be removed before Drupal 9.0.0. Use d6_field_type_defaults or d7_field_type_defaults instead. See https://www.drupal.org/node/2944589.
+ */
+ public function testDeprecatedError() {
+ $this->plugin = new FieldTypeDefaults([], 'field_type_defaults', []);
+ }
+
+}