--- /dev/null
+<?php
+
+namespace Drupal\image_test\Plugin\ImageToolkit;
+
+/**
+ * Provides a derivative of TestToolkit.
+ *
+ * @ImageToolkit(
+ * id = "test:derived_toolkit",
+ * title = @Translation("A dummy toolkit, derivative of 'test'.")
+ * )
+ */
+class DerivedToolkit extends TestToolkit { }