diff --git a/test/test_ext_render.js b/test/test_ext_render.js
new file mode 100644
index 0000000..cbd6e5d
--- /dev/null
+++ b/test/test_ext_render.js
@@ -0,0 +1,66 @@
+var x11 = require('../lib/x11');
+
+// adding XRender functions manually from
+//     http://cgit.freedesktop.org/xcb/proto/tree/src/render.xml?id=HEAD
+// and http://www.x.org/releases/X11R7.6/doc/renderproto/renderproto.txt
+// TODO: move to templates
+x11.createClient(
+    function(display) {
+        var X = display.client;
+        X.QueryExtension('RENDER', function(ext) {          
+
+            function RenderQueryVersion(clientMaj, clientMin, callback)
+            {
+                X.seq_num++;
+                X.pack_stream.pack('CCSLL', [ext.majorOpcode, 0, 3, clientMaj, clientMin]);
+                X.replies[X.seq_num] = [
+                    function(buf, opt) {
+                        var res = buf.unpack('LL');                 
+                        return res;
+                    },
+                    callback
+                ];
+                X.pack_stream.flush();
+            }
+             
+            function RenderQueryFilters(callback)
+            {
+                X.seq_num++;
+                X.pack_stream.pack('CCSL', [ext.majorOpcode, 29, 2, display.screen[0].root]);
+                X.replies[X.seq_num] = [
+                    function(buf, opt) {
+                        var h = buf.unpack('LL');                 
+                        var num_aliases = h[0];
+                        var num_filters = h[1];
+                        var aliases = [];
+                        var offset = 24; // LL + 16 bytes pad
+                        for (var i=0; i < num_aliases; ++i)
+                        {
+                            aliases.push(buf.unpack('S', offset)[0]);
+                            offset+=2;
+                        }
+                        var filters = [];
+                        for (var i=0; i < num_filters; ++i)
+                        {
+                            var len = buf.unpack('C', offset)[0];
+                            //if (!len) break;
+                            offset++;
+                            filters.push(buf.toString('ascii', offset, offset+len));
+                            offset+=len;
+                        }
+                        return [aliases, filters];
+                    },
+                    callback
+                ];
+                X.pack_stream.flush();
+            }
+
+            RenderQueryVersion(0,9, function(serverVersion) { console.log(serverVersion); });
+            RenderQueryFilters(function(resp) { console.log(resp); });
+             
+        });
+     }
+
+).on('error', function(err) {
+    console.log(err);
+});