--- /dev/null
+<?php
+
+namespace Drupal\update_test\Plugin\Archiver;
+
+use Drupal\Core\Archiver\ArchiverInterface;
+
+/**
+ * Defines a test archiver implementation.
+ *
+ * @Archiver(
+ * id = "update_test_archiver",
+ * title = @Translation("Update Test Archiver"),
+ * extensions = {"update-test-extension"}
+ * )
+ */
+class UpdateTestArchiver implements ArchiverInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function add($file_path) {
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function remove($path) {
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function extract($path, array $files = []) {
+ return $this;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function listContents() {
+ return [];
+ }
+
+}