Question

我在项目中编写了自定义模型绑定器，它使用ASP.NET MVC 2.此模型绑定器仅绑定模型的2个字段：

public class TaskFormBinder : DefaultModelBinder
{
    protected override void BindProperty(ControllerContext controllerContext,
        ModelBindingContext bindingContext,
        PropertyDescriptor propertyDescriptor)
    {           
        if (propertyDescriptor.Name == "Type")
        {
            var value = bindingContext.ValueProvider.GetValue("Type");
            var typeId = value.ConvertTo(typeof(int));
            TaskType foundedType;
            using (var nhSession = Domain.GetSession())
            {
                foundedType = nhSession.Get<TaskType>(typeId);
            }
            if (foundedType != null)
            {
                SetProperty(controllerContext, bindingContext, propertyDescriptor, foundedType);
            }
            else
            {
                AddModelBindError(bindingContext, propertyDescriptor);
            }
            return;
        }
        if (propertyDescriptor.Name == "Priority")
        { /* Other field binding ... */
            return;
        }
        base.BindProperty(controllerContext, bindingContext, propertyDescriptor);
    }
}

如何使用标准VS单元测试来测试此模型绑定器？花了几个小时谷歌搜索，找到几个例子（http://www.hanselman.com/blog/SplittingDateTimeUnitTestingASPNETMVCCustomModelBinders.aspx），但这个例子是针对MVC1的，并且在使用MVC2时不起作用。

感谢您的帮助。

Answer 1

我已修改Hanselman's MVC 1 example以测试ASP.Net MVC 2模型绑定器...

[Test]
public void Date_Can_Be_Pulled_Via_Provided_Month_Day_Year()
{
    // Arrange
    var formCollection = new NameValueCollection { 
        { "foo.month", "2" },
        { "foo.day", "12" },
        { "foo.year", "1964" }
    };

    var valueProvider = new NameValueCollectionValueProvider(formCollection, null);
    var modelMetadata = ModelMetadataProviders.Current.GetMetadataForType(null, typeof(FwpUser));

    var bindingContext = new ModelBindingContext
    {
        ModelName = "foo",
        ValueProvider = valueProvider,
        ModelMetadata = modelMetadata
    };

    DateAndTimeModelBinder b = new DateAndTimeModelBinder { Month = "month", Day = "day", Year = "year" };
    ControllerContext controllerContext = new ControllerContext();

    // Act
    DateTime result = (DateTime)b.BindModel(controllerContext, bindingContext);

    // Assert
    Assert.AreEqual(DateTime.Parse("1964-02-12 12:00:00 am"), result);
}

Answer 2

一般方法是创建一个模拟ControllerContext，模拟ModelBindingContext和模拟PropertyDescriptor，然后调用该方法。

如果您的模型绑定器使用其他服务，它看起来像你的（你正在使用NHibernate？），那么你将不得不抽象出来并提供它们的模拟。

单元测试代码如下所示：

// Arrange
ControllerContext mockControllerContext = ...;
ModelBindingContext mockModelBindingContext = ...;
PropertyDescriptor mockPropertyDescriptor = ...;
SomeService mockService = ...;

TaskFormBinder taskFormBinder = new TaskFormBinder();
taskFormBinder.Service = mockService;

// Act
taskFormBinder.BindProperty(
    mockControllerContext, mockModelBindingContext, mockPropertyDescriptor);

// Assert
// ... here you need to inspect the values in the model binding context to see that it set the right properties

您在编写单元测试时遇到了什么问题？

ASP.NET MVC 2中的单元测试自定义模型绑定器

2 个答案: