asp.net-mvc - 测试方法中的 Moq Automapper 服务在映射时返回 null

Question

我正在使用 MVC 4 构建网站并使用 Automapper 从域对象映射到 Viewmodel 对象。我已经按照此处所述注入(inject)了 Automapper http://rical.blogspot.in/2012/06/mocking-automapper-in-unit-testing.html

它在调试时在操作方法内部工作正常，但在单元测试操作方法期间，当我注入(inject)自动映射器服务时，我发现 service.map 返回 null。但是在调试映射时很好。我无法找到原因，尝试超过 4 小时。我有一个名为 Interview 的域类，其对应的 View 模型为 InterviewModel。我已将映射初始化为 CreateMap();在 automapper 配置文件配置中，已从全局启动方法调用。下面是 Controller 和 Action ...

public class NewsAndViewsController : Controller
{
    private IInterviewRepository repository;
    private IMappingService mappingService;

    public NewsAndViewsController(IInterviewRepository productRepository, IMappingService autoMapperMappingService)
    {
        repository = productRepository;
        mappingService = autoMapperMappingService;
    }

    [HttpPost, ValidateAntiForgeryToken]
    [UserId]
    public ActionResult Edit(InterviewModel interView, string userId)
    {
        if (ModelState.IsValid)
        {
            var interView1 = mappingService.Map<InterviewModel, Interview>(interView);
            **// THE ABOVE LINE RETURNING NULL WHILE RUNNING THE BELOW TEST, BUT NOT DURING DEBUGGING**
            repository.SaveInterview(interView1);
            TempData["message"] = string.Format("{0} has been saved", interView.Interviewee);
            return RedirectToAction("Create");
        }
        return View(interView);
    }
}

[TestMethod]
public void AddInterview()
{
    // Arrange
    var interviewRepository = new Mock<IInterviewRepository>();
    var mappingService = new Mock<IMappingService>();
    var im = new InterviewModel { Interviewee="sanjay", Interviewer="sanjay", Content="abc" };
    mappingService.Setup(m => m.Map<Interview, InterviewModel>(It.IsAny<Interview>())).Returns(im);
    var controller = new NewsAndViewsController(interviewRepository.Object, mappingService.Object);

    // Act
    var result = controller.Edit(im, "2") as ViewResult;

    // Assert - check the method result type
    Assert.IsNotInstanceOfType(result, typeof(ViewResult));
}

Answer 1

在您的测试中，您的 Interview 和 InterviewModel 类在 mappingService.Setup() 调用中交叉(顺便说一句，我认为您可以使用更好的命名约定，或者不使用 var，以保留您的对象清晰 - “im”、“interview” 和 “interview1” 让人很难理解哪个是模型，哪个是 View 对象)。

试试这个:

[TestMethod]
public void AddInterview()
{
    // Arrange
    var interviewRepository = new Mock<IInterviewRepository>();
    var mappingService = new Mock<IMappingService>();
    var interview = new Interview();
    var im = new InterviewModel { Interviewee="sanjay", Interviewer="sanjay", Content="abc" };
    mappingService.Setup(m => m.Map<InterviewModel, Interview>(im).Returns(interview);
    var controller = new NewsAndViewsController(interviewRepository.Object, mappingService.Object);

    // Act
    var result = controller.Edit(im, "2") as ViewResult;

    // Assert - check the method result type
    Assert.IsNotInstanceOfType(result, typeof(ViewResult));
}