How we make unit test code of this method using shim

I have a method of wcf calling in xamarin and want to create the test code of this method using shim fake

    public Dictionary<int, string> GetProductCategory()
    {
        BasicHttpBinding binding = AceWCFBinding.CreateBasicHttp();
        using ( AceWCFClientWrapper<AceVqbzServiceClient> objAceWCFClientWrapper = new AceWCFClientWrapper<AceVqbzServiceClient>( binding, AceWCFBinding.EndPoint ) )
        {
            IAceVqbzService aceVqbzTypeService = objAceWCFClientWrapper._proxy as IAceVqbzService;
            var _task = Task<Dictionary<int, string>>.Factory.FromAsync( aceVqbzTypeService.BeginGetProductCategory, aceVqbzTypeService.EndGetProductCategory, TaskCreationOptions.None );
            Dictionary<int, string> _res = _task.Result;
            return _res;
        }
    } 

Please provide me the way how i will manage the test code of this method