asp.net-mvc-4 - 如何为 IValidatableObject 模型编写单元测试

Question

我创建了一个 ViewModel，如下所示。

   public class ProjectViewModel: IValidatableObject
    {
        public int ProjectID { get; set; }

        [DisplayName("Name")]
        [Required]
        public string Name { get; set; }

        [DisplayName("Start Date")]
        public DateTime StartDate { get; set; }

        [DisplayName("End Date")]
        [Compare("EndDate")]
        public DateTime EndDate { get; set; }

        [DisplayName("Project States")]
        public List<ProjectStateViewModel> States { get; set; }
        public string PageTitle { get; set; }


        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            List<ValidationResult> res = new List<ValidationResult>();
            if (EndDate <= StartDate)
            {
                res.Add( new ValidationResult(ErrorMessage.END_DATE_AFTER_START_DATE));
            }

            return res;
        }
    }

还写了下面的测试用例

[TestMethod]
[ExpectedException( typeof(ValidationException),"End Date must be greater than Start Date.")]
public void Create_New_Project_EndDate_Earlier_StartDate()
{
    ProjectViewModel model = new ProjectViewModel
    {
        ProjectID = 3,
        Name = "Test Project",
        StartDate = DateTime.Now.Date,
        EndDate = DateTime.Now.AddMonths(-1),
        States = new List<ProjectStateViewModel> { new ProjectStateViewModel { StateName = "Pending" } }
    };

    Task<ActionResult> task = _projectController.Edit(model);

    ViewResult result = task.Result as ViewResult;

}

当实际代码通过浏览器在 MVC 应用程序中执行时，它工作正常。但是 ModelState.IsValid 在我的单元测试中总是返回 true 并且它失败了。 后来我明白了验证不是由 Controller 执行的。 Controller 在验证发生后收到模型，因此它将具有适当的 ModelState。 我的问题是我应该用什么方法来编写模型验证的单元测试，还是应该编写它？

Answer 1

您可以直接调用该方法并对其结果进行断言。

[TestMethod]
public void Create_New_Project_EndDate_Earlier_StartDate()
{
    ProjectViewModel model = new ProjectViewModel
    {
        ProjectID = 3,
        Name = "Test Project",
        StartDate = DateTime.Now.Date,
        EndDate = DateTime.Now.AddMonths(-1),
        States = new List<ProjectStateViewModel> { new ProjectStateViewModel { StateName = "Pending" } }
    };

    var validationContext = new ValidationContext(model);

    var results = model.Validate(validationContext);

    Assert.AreEqual(results.Count(), 1);
    Assert.AreEqual(results.First().ErrorMessage, "End Date must be greater than Start Date.");
}