为什么我不能使用NSubstitute在MVP中模拟一个视图属性

Question

我正在尝试在MVP应用程序中对我的演示者进行单元测试。这是我的视图界面，​​我试图使用NSubstitude模拟：

public interface ICategoriesView : IBaseViewInterface
{
    string CategoryName { get; }
    long CategorId { get; }
    long CategoryParent { get; }
    IEnumerable<EntityObject> CategoryDataSource { set; }
}

这是我的单元测试类。我正在使用NUnit框架：

[TestFixture]
public class CategoriesTests
{
    [Test(Description="this is used for testing the behavior of presenter if we pass empty name.")]
    public void Add_EmptyName_Fails()
    {
        var _view = NSubstitute.Substitute.For<ICategoriesView>();
        //now here i'm supposed to get something like _view.CategoryId.Returns(2) but i don't!
        //the error message says that _view.CategoryId doesn't have an extension method 
        //named Returns. and it's true since intellisence doesn't list it after period
    }
}

我将set modifer添加到视图界面，​​但它不起作用。那有什么不对？

Answer 1

实际上我忘了在我的测试类之上添加一个使用NSubstitude。