diff --git a/js/x11/examples/smoketest/cleararea.js b/js/x11/examples/smoketest/cleararea.js
new file mode 100644
index 0000000..eedff2a
--- /dev/null
+++ b/js/x11/examples/smoketest/cleararea.js
@@ -0,0 +1,15 @@
+var x11 = require('../../lib');
+var Window = require('./wndwrap');
+
+x11.createClient(function(err, display) {
+    var X = display.client;
+    var w = new Window(X, 0, 0, 700, 500);
+    w.map();
+
+    w.on('expose', function() {
+      var gc = X.AllocID();
+      X.CreateGC(gc, w.id, { foreground: w.black, background: w.white });
+      X.PolyFillRectangle(w.id, gc, [50, 50, 600, 400]);
+      X.ClearArea(w.id, 0, 0, 300, 300, 0);
+    });
+});