diff --git a/js/x11/core/examples/smoketest/polyline.js b/js/x11/core/examples/smoketest/polyline.js
new file mode 100644
index 0000000..4ba91ee
--- /dev/null
+++ b/js/x11/core/examples/smoketest/polyline.js
@@ -0,0 +1,45 @@
+var x11 = require('../../lib');
+
+var Exposure = x11.eventMask.Exposure;
+var PointerMotion = x11.eventMask.PointerMotion;
+var pts = [];
+
+var prevPoint;
+
+x11.createClient(function(err, display) {
+    var X = display.client;
+    var root = display.screen[0].root;
+    var white = display.screen[0].white_pixel;
+    var black = display.screen[0].black_pixel;
+
+    var wid = X.AllocID();
+    X.CreateWindow(
+       wid, root, 
+       0, 0, 400, 300, 
+       0, 0, 0, 0,
+       { 
+           backgroundPixel: white, eventMask: Exposure|PointerMotion  
+       }
+    );
+    X.MapWindow(wid);
+  
+    var gc = X.AllocID();
+    X.CreateGC(gc, wid, { foreground: black, background: white } );
+    
+    X.on('event', function(ev) {
+        if (ev.type == 12)
+        {
+            if (pts.length > 4)
+                X.PolyLine(0, wid, gc, pts);
+        } else if (ev.type == 6) {
+            pts.push(ev.x);
+            pts.push(ev.y);
+            if (pts.length > 4)
+                X.PolyLine(0, wid, gc, pts.slice(-4));
+        }
+    });
+
+    X.on('error', function(e) {
+        console.log(e);
+    });
+});