{ setup: function() {      

    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");

    });