Moq、SetupGet、Mocking 属性

问题描述

我正在尝试模拟一个名为 UserInputEntity 的类，它包含一个名为 ColumnNames 的属性:(它确实包含其他属性，我只是将其简化为问题)

I'm trying to mock a class, called UserInputEntity, which contains a property called ColumnNames: (it does contain other properties, I've just simplified it for the question)

namespace CsvImporter.Entity
{
    public interface IUserInputEntity
    {
        List<String> ColumnNames { get; set; }
    }

    public class UserInputEntity : IUserInputEntity
    {
        public UserInputEntity(List<String> columnNameInputs)
        {
            ColumnNames = columnNameInputs;
        }

        public List<String> ColumnNames { get; set; }
    }
}

我有一个演讲者课程:

namespace CsvImporter.UserInterface
{
    public interface IMainPresenterHelper
    {
        //...
    }

    public class MainPresenterHelper:IMainPresenterHelper
    {
        //....
    }

    public class MainPresenter
    {
        UserInputEntity inputs;

        IFileDialog _dialog;
        IMainForm _view;
        IMainPresenterHelper _helper;

        public MainPresenter(IMainForm view, IFileDialog dialog, IMainPresenterHelper helper)
        {
            _view = view;
            _dialog = dialog;
            _helper = helper;
            view.ComposeCollectionOfControls += ComposeCollectionOfControls;
            view.SelectCsvFilePath += SelectCsvFilePath;
            view.SelectErrorLogFilePath += SelectErrorLogFilePath;
            view.DataVerification += DataVerification;
        }


        public bool testMethod(IUserInputEntity input)
        {
            if (inputs.ColumnNames[0] == "testing")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}

我尝试了以下测试，在其中模拟实体，尝试获取 ColumnNames 属性以返回已初始化的 List() 但它不起作用:

I've tried the following test, where I mock the entity, try to get ColumnNames property to return a initialized List<string>() but it's not working:

    [Test]
    public void TestMethod_ReturnsTrue()
    {
        Mock<IMainForm> view = new Mock<IMainForm>();
        Mock<IFileDialog> dialog = new Mock<IFileDialog>();
        Mock<IMainPresenterHelper> helper = new Mock<IMainPresenterHelper>();

        MainPresenter presenter = new MainPresenter(view.Object, dialog.Object, helper.Object);

        List<String> temp = new List<string>();
        temp.Add("testing");

        Mock<IUserInputEntity> input = new Mock<IUserInputEntity>();

    //Errors occur on the below line.
        input.SetupGet(x => x.ColumnNames).Returns(temp[0]);

        bool testing = presenter.testMethod(input.Object);
        Assert.AreEqual(testing, true);
    }

我得到的错误表明存在一些无效参数 + 参数 1 无法从字符串转换为

The errors I get state that there are some invalid arguments + Argument 1 cannot be converted from string to

System.Func<System.Collection.Generic.List<string>>

任何帮助将不胜感激.

推荐答案

ColumnNames 是 List 类型的属性，因此在设置时需要在 Returns 调用中传递 List 作为参数(或返回 List 的函数)

ColumnNames is a property of type List<String> so when you are setting up you need to pass a List<String> in the Returns call as an argument (or a func which return a List<String>)

但是使用这一行，您试图只返回一个 string

But with this line you are trying to return just a string

input.SetupGet(x => x.ColumnNames).Returns(temp[0]);

导致异常的原因.

更改它以返回整个列表:

Change it to return whole list:

input.SetupGet(x => x.ColumnNames).Returns(temp);

这篇关于Moq、SetupGet、Mocking 属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！