我该如何测试ModelState？

Question

我该如何测试Controller.ViewData.ModelState ？ 我宁愿没有任何模拟框架。

Answer 1

当然，如果您正在为数据使用存储库模式，则不必使用模拟。

一些例子： http ： //www.singingeels.com/Articles/Test_Driven_Development_with_ASPNET_MVC.aspx

// Test for required "FirstName".
   controller.ViewData.ModelState.Clear();

   newCustomer = new Customer
   {
       FirstName = "",
       LastName = "Smith",
       Zip = "34275",    
   };

   controller.Create(newCustomer);

   // Make sure that our validation found the error!
   Assert.IsTrue(controller.ViewData.ModelState.Count == 1, 
                 "FirstName must be required.");

Answer 2

//[Required]
//public string Name { get; set; }
//[Required]
//public string Description { get; set; }

ProductModelEdit model = new ProductModelEdit() ;
//Init ModelState
var modelBinder = new ModelBindingContext()
{
    ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(
                      () => model, model.GetType()),
    ValueProvider=new NameValueCollectionValueProvider(
                        new NameValueCollection(), CultureInfo.InvariantCulture)
};
var binder=new DefaultModelBinder().BindModel(
                 new ControllerContext(),modelBinder );
ProductController.ModelState.Clear();
ProductController.ModelState.Merge(modelBinder.ModelState);

ViewResult result = (ViewResult)ProductController.CreateProduct(null,model);
Assert.IsTrue(result.ViewData.ModelState["Name"].Errors.Count > 0);
Assert.True(result.ViewData.ModelState["Description"].Errors.Count > 0);
Assert.True(!result.ViewData.ModelState.IsValid);

Answer 3

要测试Web API，请在控制器上使用Validate方法：

var controller = new MyController();
controller.Configuration = new HttpConfiguration();
var model = new MyModel();

controller.Validate(model);
var result = controller.MyMethod(model);

Answer 4

为.NetCore 2.1解决这个问题这是我的解决方案：

扩展方法

using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace MyExtension
{
    public static void BindViewModel<T>(this Controller controller, T model)
    {
        if (model == null) return;

        var context = new ValidationContext(model, null, null);
        var results = new List<ValidationResult>();

        if (!Validator.TryValidateObject(model, context, results, true))
        {
            controller.ModelState.Clear();
            foreach (ValidationResult result in results)
            {
                var key = result.MemberNames.FirstOrDefault() ?? "";
                controller.ModelState.AddModelError(key, result.ErrorMessage);
            }
        }
    }
}

查看模型

public class MyViewModel
{
    [Required]
    public string Name { get; set; }
}

单元测试

public async void MyUnitTest()
{
    // helper method to create instance of the Controller
    var controller = this.CreateController();

    var model = new MyViewModel
    {
        Name = null
    };

    // here we call the extension method to validate the model
    // and set the errors to the Controller's ModelState
    controller.BindViewModel(model);

    var result = await controller.ActionName(model);

    Assert.NotNull(result);
    var viewResult = Assert.IsType<BadRequestObjectResult>(result);
}

Answer 5

这不仅可以让您检查错误是否存在，还可以检查它是否具有与预期完全相同的错误消息。 例如，这两个参数都是必需的，因此它们的错误消息显示为“必需”。

型号标记：

//[Required]
//public string Name { get; set; }
//[Required]
//public string Description { get; set; }

单元测试代码：

ProductModelEdit model = new ProductModelEdit() ;
//Init ModelState
var modelBinder = new ModelBindingContext()
{
    ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(
                      () => model, model.GetType()),
    ValueProvider=new NameValueCollectionValueProvider(
                        new NameValueCollection(), CultureInfo.InvariantCulture)
};
var binder=new DefaultModelBinder().BindModel(
                 new ControllerContext(),modelBinder );
ProductController.ModelState.Clear();
ProductController.ModelState.Merge(modelBinder.ModelState);

ViewResult result = (ViewResult)ProductController.CreateProduct(null,model);
Assert.IsTrue(!result.ViewData.ModelState.IsValid);
//Make sure Name has correct errors
Assert.IsTrue(result.ViewData.ModelState["Name"].Errors.Count > 0);
Assert.AreEqual(result.ViewData.ModelState["Name"].Errors[0].ErrorMessage, "Required");
//Make sure Description has correct errors
Assert.IsTrue(result.ViewData.ModelState["Description"].Errors.Count > 0);
Assert.AreEqual(result.ViewData.ModelState["Description"].Errors[0].ErrorMessage, "Required");

Answer 6

除了上面的好答案，请在Controller类中查看受保护的TryValidateModel方法的这种奇妙用法。

只需创建一个继承自controller的测试类，并将模型传递给TryValidateModel方法。 这是链接： http ： //blog.icanmakethiswork.io/2013/03/unit-testing-modelstate.html

完全归功于John Reilly和Marc Talary的解决方案。