public async Task GetWorkItemsAsync_WhenCalled_ReturnsAllWorkItemsWithIteration()
        {
            // Act
            List <WorkItem> workItems = null;

            using (var context = new OnlineShopContext(options))
            {
                var sut = new WorkItemService(context);
                workItems = (await sut.GetWorkItemsAsync()).ToList();
            }

            // Assert
            Assert.NotNull(workItems);
            Assert.Equal(3, workItems.Count());
            Assert.NotNull(workItems[0].Iteration);
            Assert.NotNull(workItems[1].Iteration);
            Assert.NotNull(workItems[2].Iteration);
        }