--- /dev/null
+<?php
+
+namespace Drupal\entity_test\Entity;
+
+/**
+ * Defines the test entity class for testing definition addition.
+ *
+ * This entity type is initially not defined. It is enabled when needed to test
+ * the related updates.
+ *
+ * @ContentEntityType(
+ * id = "entity_test_new",
+ * label = @Translation("New test entity"),
+ * base_table = "entity_test_new",
+ * entity_keys = {
+ * "id" = "id",
+ * "uuid" = "uuid",
+ * "bundle" = "type",
+ * "label" = "name",
+ * "langcode" = "langcode",
+ * }
+ * )
+ */
+class EntityTestNew extends EntityTest {
+}