Allow to remove items from the basket setting quantity to zero

tests/IntegrationTests/Repositories/BasketRepositoryTests/SetQuantities.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.eShopWeb.ApplicationCore.Entities.BasketAggregate;
+using Microsoft.eShopWeb.ApplicationCore.Interfaces;
+using Microsoft.eShopWeb.ApplicationCore.Services;
+using Microsoft.eShopWeb.Infrastructure.Data;
+using Microsoft.eShopWeb.UnitTests.Builders;
+using Xunit;
+
+namespace Microsoft.eShopWeb.IntegrationTests.Repositories.BasketRepositoryTests
+{
+    public class SetQuantities
+    {
+        private readonly CatalogContext _catalogContext;
+        private readonly IAsyncRepository<Basket> _basketRepository;
+        private readonly BasketBuilder BasketBuilder = new BasketBuilder();
+
+        public SetQuantities()
+        {
+            var dbOptions = new DbContextOptionsBuilder<CatalogContext>()
+                .UseInMemoryDatabase(databaseName: "TestCatalog")
+                .Options;
+            _catalogContext = new CatalogContext(dbOptions);
+            _basketRepository = new EfRepository<Basket>(_catalogContext);
+        }
+
+        [Fact]
+        public async Task RemoveEmptyQuantities()
+        {
+            var basket = BasketBuilder.WithOneBasketItem();
+            var basketService = new BasketService(_basketRepository, null);
+            await _basketRepository.AddAsync(basket);
+            _catalogContext.SaveChanges();
+
+            await basketService.SetQuantities(BasketBuilder.BasketId, new Dictionary<string, int>() { { BasketBuilder.BasketId.ToString(), 0 } });
+
+            Assert.Equal(0, basket.Items.Count);
+        }
+    }
+}