--- /dev/null
+<?php
+
+namespace Drupal\plugin_test\Plugin\plugin_test\fruit;
+
+use Drupal\non_installed_module\Plugin\plugin_test\fruit\YummyFruit;
+
+/**
+ * @Plugin(
+ * id = "extending_non_installed_class",
+ * label = "A plugin whose class is extending from a non-installed module class",
+ * color = "pink",
+ * )
+ */
+class ExtendingNonInstalledClass extends YummyFruit { }