public static void func_pointer_marshalling()
        {
            var  obj    = new Dummy.TestObject();
            bool called = false;

            Eina.Strbuf buf      = new Eina.Strbuf();
            string      argument = "Some String";

            Eina.Value v = new Eina.Value(Eina.ValueType.String);
            v.Set(argument);
            string reference = new string(argument.ToCharArray().Reverse().ToArray());

            obj.CallFormatCb(buf, v, (Eina.Strbuf ibuf, Eina.Value val) => {
                called     = true;
                string str = null;
                val.Get(out str);
                buf.Append(new string(str.ToCharArray().Reverse().ToArray()));
            });

            Test.Assert(called, "Callback was not called");
            Test.AssertEquals(reference, buf.Steal());
            v.Dispose();
            buf.Dispose();
            obj.Dispose();
        }