public async Task GetInventory()
        {
            var inventory = await inventoryApi.GetInventory(TEST_SKU);

            Assert.True(inventory.Sku.Length > 0);
            Assert.True(inventory.Quantity.Amount >= 0);
        }
        public async Task CanGetInventoryForSpecificSku()
        {
            var result = await inventoryApi.GetInventory("test");

            Assert.IsType <Inventory>(result);
            Assert.NotEmpty(result.Sku);
            Assert.True(result.Quantity.Amount > 0);
        }