diff --git a/js/x11/core/examples/smoketest/querytree.js b/js/x11/core/examples/smoketest/querytree.js
new file mode 100644
index 0000000..d0fba49
--- /dev/null
+++ b/js/x11/core/examples/smoketest/querytree.js
@@ -0,0 +1,12 @@
+var x11 = require('../../lib');
+var wid = process.argv[2];
+console.log(wid);
+var wids = [];
+x11.createClient(function(err, display) {
+    var X = display.client;
+    var root = display.screen[0].root;
+    X.QueryTree(wid ? wid : root, function(err, tree) {
+        console.log(tree);    
+        X.terminate();
+    });
+});