diff --git a/js/x11/core/examples/smoketest/query_ext.js b/js/x11/core/examples/smoketest/query_ext.js
new file mode 100644
index 0000000..3713ac0
--- /dev/null
+++ b/js/x11/core/examples/smoketest/query_ext.js
@@ -0,0 +1,17 @@
+var x11 = require('../../lib');
+var X = x11.createClient();
+var numExt = 0;
+X.on('connect', function(err, display) {
+    X.ListExtensions(function(err, list) {
+        console.log(list);
+        list.forEach(function(ext) {
+            numExt++;
+            X.QueryExtension(ext, function(err, e) {
+                e.name = ext;
+                console.log(e);
+                if (--numExt == 0)
+                    X.terminate();
+            });
+        });
+    });
+});