如何使用 return "this" 的 Moq 方法

Question

我有接口

interface IService
{
    IService Configure();
    bool Run();
}

"real" 实现是这样做的：

class RealService : IService
{
    public IService Configure()
    {
        return this;
    }

    public bool Run()
    {
        return true;
    }
}

使用 Moq 模拟服务创建 Configure() 的默认实现 returns null。

有没有一种方法可以在 return 模拟实例的起订量中设置方法？

Answer 1

您可以创建另一个使用相同接口的 Mock 对象，return 它：

[TestClass]
public class UnitTest1
{

    [TestMethod]
    public void TestMethod1()
    {
        var serviceMock1 = new Mock<IService>();
        var serviceMock2 = new Mock<IService>();

        serviceMock1.Setup(service => service.Configure())
            .Returns(serviceMock2.Object);

        var testClass = new TestClass(serviceMock1.Object);

        Assert.IsNotNull(testClass.DoStuff());
    }
}

public class TestClass
{
    private readonly IService _service;

    public TestClass(IService service)
    {
        _service = service;
    }

    public IService DoStuff()
    {
        return _service.Configure();
    }
}


public interface IService
{
    IService Configure();
    bool Run();
}

public class RealService : IService
{
    public IService Configure()
    {
        return this;
    }

    public bool Run()
    {
        return true;
    }
}

Answer 2

假设您正在使用 Moq，您可以简单地 Setup 模拟到 return 本身：

var mock = new Mock<IService>();

mock.Setup(service => service.Configure()).Returns(mock.Object);

var testClass = new TestClass(mock.Object);

然后验证方法是否return符合您的预期：

Assert.AreEqual(mock.Object, testClass.DoStuff());

Answer 3

任何一种方法都可以设置 return 模拟实例的方法。

//Arrange
var instance = Mock.Of<IService>();//mocked instance
var mockService = Mock.Get(instance);//mock object used to setup instance functionality
//setup method to return mocked instance
mockService.Setup(m => m.Configure()).Returns(instance);

或者

//Arrange
var mockService = new Mock<IService>();//mock object used to setup instance functionality
var instance = mockService.Object;//mocked instance
//setup method to return mocked instance
mockService.Setup(m => m.Configure()).Returns(instance);

如何使用 return "this" 的 Moq 方法

How to Moq methods that return "this"

c#

unit-testing

moq