diff --git a/js/x11/examples/smoketest/listext.js b/js/x11/examples/smoketest/listext.js
new file mode 100644
index 0000000..3944d5b
--- /dev/null
+++ b/js/x11/examples/smoketest/listext.js
@@ -0,0 +1,10 @@
+var x11 = require('../../lib');
+var X = x11.createClient();
+X.on('connect', function(err, display) {
+    X.ListExtensions(function(err, list) {
+        list.forEach(function(ext) {
+            console.log(ext);
+        });
+        X.terminate();
+    });
+});