diff -r 5469b2b9743f -r 3f7a2e8a948f unittests/tests/JSONSerializer.js
--- a/unittests/tests/JSONSerializer.js	Wed Oct 12 13:59:38 2011 +0200
+++ b/unittests/tests/JSONSerializer.js	Wed Oct 12 14:00:14 2011 +0200
@@ -1,6 +1,6 @@
 function test_JSONSerializer() {
   module("JSON Serializer tests", 
-    { setup: function() {
+    { setup: function() {      
       this.dt = new IriSP.DataLoader();
       }
     }
@@ -12,5 +12,29 @@
 
       equal(serializer.serialize(arr), JSON.stringify(arr), "assert that the outputted json is correct");
     });
+    
+    test("sync() - callback should get called", function() {
+      this.xhr = this.sandbox.useFakeXMLHttpRequest();
+      this.requests = [];
+      this.xhr.onCreate = function (request) {
+        this.requests.push(request);
+      };
+      
+      var response_array = [{ media: 12, content: "Hey there" }];
+      var response_string = JSON.stringify(response_array);
+  
+      var spy_callback = this.spy();
+      var ser = new IriSP.JSONSerializer(this.dt, "/url");
+      
+      ser.sync(spy_callback);
+      
+      equals(this.xhr.requests.length, 1, "the mock ajax object should have received the request");
+      this.xhr.requests[0].respond(200, { "Content-Type": "application/json" },
+                             response_string);
+        
+      ok(spy_callback.calledOnce, "callback called");
+      ok(spy_callback.calledWith(response_array), "callback called with correct value");
+      deepEqual(ser._data, response_array, "the internal variable is initialized to the correct value");
+    });
 
 };
\ No newline at end of file