--- /dev/null
+<?php
+
+namespace Drupal\js_ajax_test\Ajax;
+
+use Drupal\Core\Ajax\CommandInterface;
+
+/**
+ * Test Ajax command.
+ */
+class JsAjaxTestCommand implements CommandInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function render() {
+ return [
+ 'command' => 'jsAjaxTestCommand',
+ 'selector' => '#js_ajax_test_form_wrapper',
+ ];
+ }
+
+}