public async Task ConvertAsync_WithNeitherItemCategoryNorManufacturer_ShouldConvertToReadModel()
        {
            // Arrange
            var local   = new LocalFixture();
            var service = local.CreateService();

            var store = local.CreateStore();
            var items = local.CreateItemsWithNeitherItemCategoryNorManufacturer(store).ToList();

            var itemCategoryIds = items
                                  .Where(i => i.ItemCategoryId != null)
                                  .Select(i => i.ItemCategoryId);

            var manufacturerIds = items
                                  .Where(i => i.ManufacturerId != null)
                                  .Select(i => i.ManufacturerId);

            var itemCategoryDict = local.CreateItemCategories(itemCategoryIds);
            var manufacturerDict = local.CreateManufacturers(manufacturerIds);

            local.ItemCategoryRepositoryMock.SetupFindByAsync(itemCategoryIds, itemCategoryDict.Values);
            local.ManufacturerRepositoryMock.SetupFindByAsync(manufacturerIds, manufacturerDict.Values);

            // Act
            var result = await service.ConvertAsync(items, store, default);

            // Assert
            var expected = local.ToSimpleReadModels(items, store, itemCategoryDict, manufacturerDict);

            using (new AssertionScope())
            {
                result.Should().BeEquivalentTo(expected);
            }
        }