public async Task GetBasket_Not_Exist_Basket_Test()
        {
            var basketViewModelService = new BasketViewModelService(_basketRepository.Object, _itemRepository.Object);

            var result = await basketViewModelService.GetBasket(_username);

            _basketRepository.Verify(x => x.AddAsync(It.IsAny <Basket>()));
            Assert.IsType <BasketModel>(result);
            Assert.Equal(_username, result.OwnerId);
        }
        public async Task GetBasket_Basket_Test()
        {
            var basketViewModelService = new BasketViewModelService(_basketRepository.Object, _itemRepository.Object);

            _baskets.Add(new Basket(_username));

            var result = await basketViewModelService.GetBasket(_username);

            Assert.IsType <BasketModel>(result);
            Assert.Equal(_username, result.OwnerId);
        }