Question

我想为下面的控制器方法编写一个xunit测试

        [HttpGet]
        [Route("GetPosts")]
        public async Task<IActionResult> GetPosts()
        {
            try
            {
                var posts = await postRepository.GetPosts();
                if (posts == null)
                {
                    return NotFound();
                }

                return Ok(posts);
            }
            catch (Exception)
            {
                return BadRequest();
            }
        }

我的视图模型如下所示。

        public class PostViewModel
            {
                public int PostId { get; set; }
                public string Title { get; set; }
                public string Description { get; set; }
                public int? CategoryId { get; set; }
                public DateTime? CreatedDate { get; set; }
                public string CategoryName { get; set; }
            }

这是我的存储库的外观。

        public async Task<List<PostViewModel>> GetPosts()
                {
                    if (db != null)
                    {
                        return await (from p in db.Post
                                      from c in db.Category
                                      where p.CategoryId == c.Id
                                      select new PostViewModel
                                      {
                                          PostId = p.PostId,
                                          Title = p.Title,
                                          Description = p.Description,
                                          CategoryId = p.CategoryId,
                                          CategoryName = c.Name,
                                          CreatedDate = p.CreatedDate
                                      }).ToListAsync();
                    }

                    return null;
        }

我开始收到此错误消息

        cannot convert from 'System.Collections.Generic.List<CoreServices.ViewModel.PostViewModel>' 
        to 'System.Threading.Tasks.Task<System.Collections.Generic.List<CoreServices.ViewModel.PostViewModel>>'

这是我的xunit测试的样子。

        public class PostControllerTest
        {
            private readonly Mock<IPostRepository> _mockRepo;
            private readonly PostController  _controller;

            public PostControllerTest()
            {
                _mockRepo = new Mock<IPostRepository>();
                _controller = new PostController(_mockRepo.Object);
            }

            [Fact]
            public void GetPosts_TaskExecutes_ReturnsExactNumberOfPosts()
            {
                _mockRepo.Setup(repo => repo.GetPosts())
                    .Returns(new List<PostViewModel>() { new PostViewModel(), new PostViewModel() });

                    //var result = 
                    //Assert.True()
            }
        }

我想完成我的第一个测试，该测试将显示该帖子的计数为2（模拟依赖项）。我该如何编写/完成此测试？

Answer 1

除了您的退货价值设置外，我认为其他一切都很好。您需要返回一个任务。试试这个

_mockRepo.Setup(repo => repo.GetPosts())
                    .Returns(Task.FromResult(new List<PostViewModel>() { new PostViewModel(), new PostViewModel() }));

Answer 2

尝试使用ReturnsAsync代替Returns。 GetPosts是异步方法。

在ASP.NET Core Web API中编写方法测试

2 个答案: