在Asp.Net MVC Web Api中测试Controller时，ModelState.IsValid始终为true

Question

我试图完成这项工作并进行了许多google / stackoverflow搜索而根本没有运气。

我有一个简单的模型：

public class MovieModel
{
    public string Id { get; set; }

    [Required]
    [StringLength(100)]
    public string Name { get; set; }
}

控制器中的方法：

// POST: api/Movies
public IHttpActionResult Post([FromBody]MovieModel movieModel)
{
    if (ModelState.IsValid)
    {
        //Code
    }
}

一个测试方法（是一个集成测试，但在单元测试中会发生同样的情况）：

[TestMethod]
public void MoviesController_Post_Without_Name()
{
    // Arrange
    var model = new MovieModel();
    model.Name = "";

    // Act
    var result = controller.Post(model);

    // Assert
    Assert.IsInstanceOfType(result, typeof(InvalidModelStateResult));
    Assert.AreEqual(6, controller.Get().Count());
}

尽管模型显然无效，但它始终将IsValid属性评估为true。

到目前为止，我尝试了许多方法但没有成

Answer 1

您的解决方案可能有效，但更好的方法是使用ApiController.Validate方法。

public void MoviesController_Post_Without_Name()
{
    // Arrange
    var model = new MovieModel();
    model.Name = "";

    // Act
    controller.Validate(model);   //<---- use the built-in method
    var result = controller.Post(model);

    // Assert
    Assert.IsInstanceOfType(result, typeof(InvalidModelStateResult));
    Assert.AreEqual(6, controller.Get().Count());
}

Answer 2

感谢this网站，我找到了解决方案：

private void SimulateValidation(object model)
{
    // mimic the behaviour of the model binder which is responsible for Validating the Model
    var validationContext = new ValidationContext(model, null, null);
    var validationResults = new List<ValidationResult>();
    Validator.TryValidateObject(model, validationContext, validationResults, true);
    foreach (var validationResult in validationResults)
    {
        this.controller.ModelState.AddModelError(validationResult.MemberNames.First(), validationResult.ErrorMessage);
    }
}

并在测试方法中包含一行，如下所示：

public void MoviesController_Post_Without_Name()
{
    // Arrange
    var model = new MovieModel();
    model.Name = "";

    // Act
    SimulateValidation(model);
    var result = controller.Post(model);

    // Assert
    Assert.IsInstanceOfType(result, typeof(InvalidModelStateResult));
    Assert.AreEqual(6, controller.Get().Count());
}

希望能帮到某个人，这样可以节省我一些时间在网上搜索。

Answer 3

这对我有用：

public MyResultData Post([FromBody] MyQueryData queryData)
{
    if (!this.Request.Properties.ContainsKey("MS_HttpConfiguration")) 
    {
        this.Request.Properties["MS_HttpConfiguration"] = new HttpConfiguration();
    }

    this.Validate(queryData);

    if (ModelState.IsValid)
    {
        DoSomething();
    }
}

另请查看这个问题：Validate fails in unit tests

Answer 4

在WebAPI 5.2.7上：

[TestMethod]
public void MoviesController_Post_Without_Name()()
{
    // Arrange
    var model = new MovieModel();
    model.Name = "";

    controller.Request = new HttpRequestMessage();
    controller.Configuration = new HttpConfiguration();
    controller.Validate(model);

    // Act
    var result = controller.Post(model);

    // Assert
    ...

这篇文章帮助了我：https://www.c-sharpcorner.com/article/unit-testing-controllers-in-web-api/