如何在Moq中设置重载的方法调用?

时间:2012-06-24 02:39:57

标签: c# moq overloading

我正在尝试模拟映射接口IMapper

public interface IMapper<TFoo, TBar> {
    TBar Map(TFoo foo);
    TFoo Map(TBar bar);
}

在我的测试中,我将模拟映射器设置为期望调用每个(在NHibernate update操作周围):

//...
_mapperMock.Setup(m => m.Map(fooMock.Object)).Returns(barMock.Object);
_mapperMock.Setup(m => m.Map(barMock.Object)).Returns(fooMock.Object);
//...

但是,当进行第二次Map调用时,mapper mock会抛出,因为它只需要一次调用。

在运行时设置期间观察映射器模拟,我可以看到Map(TFoo foo)重载已注册,然后在设置Map(TBar bar)重载时看到它被替换。

这是Moq处理设置方式的问题,还是在这种情况下我需要使用不同的语法?

修改 以下是测试构造函数的实际实例化代码:

public class TestClass {
    private readonly MockRepository _repository = new MockRepository(MockBehavior.Strict);

    public TestClass() {
        //...
        _mapperMock = _repository.Create
            <IMapper<RequestData.Foo, ResponseData.Bar>>();
        //...
     }
}

编辑2

这是一个完整的失败测试用例:

public interface IMapper<TFoo, TBar> {
    TFoo Map(TBar bar);
    TBar Map(TFoo foo);
}

public class Foo {
    public override int GetHashCode() {
        // return base.GetHashCode();
        return 1;
    }
}

public class Bar {
    public override int GetHashCode() {
        // return base.GetHashCode();
        return 2;
    }
}

[Test]
public void TestIt()
{
    // Arrange
    var _mapperMock = new Mock<IMapper<Foo, Bar>>(MockBehavior.Strict);
    var fooMock = new Mock<Foo>();
    var barMock = new Mock<Bar>();

    _mapperMock.Setup(m => m.Map(fooMock.Object)).Returns(barMock.Object);
    _mapperMock.Setup(m => m.Map(barMock.Object)).Returns(fooMock.Object);

    // Act - breaks on first line below this comment
    var bar = _mapperMock.Object.Map(fooMock.Object);
    var foo = _mapperMock.Object.Map(barMock.Object);

    // Assert
    _mapperMock.Verify(x => x.Map(fooMock.Object), Times.Once());
    _mapperMock.Verify(x => x.Map(barMock.Object), Times.Once());
}

如果我在GetHashCode()Foo或两者上注释Bar覆盖,则测试用例通过。或者,如果我不使用MockFoo的{​​{1}},则测试用例会通过。

编辑3 我打开了Moq Issue 347来解决这个问题,并提供了更详细的测试用例。

1 个答案:

答案 0 :(得分:2)

不确定你的FooBar类是什么样的,但是这个测试通过了我(Moq 4.0.10827.0,这是NuGet中的最新版本)

using Moq;
using NUnit.Framework;

namespace ConsoleApplication1
{
    [TestFixture]
    public class Tests
    {
        [Test]
        public void TestIt()
        {
            // Arrange
            var _mapperMock = new Mock<IMapper<Foo, Bar>>();
            var fooMock = new Mock<Foo>();
            var barMock = new Mock<Bar>();

            _mapperMock.Setup(m => m.Map(fooMock.Object)).Returns(barMock.Object);
            _mapperMock.Setup(m => m.Map(barMock.Object)).Returns(fooMock.Object);

            // Act
            var bar = _mapperMock.Object.Map(fooMock.Object);
            var foo = _mapperMock.Object.Map(barMock.Object);

            // Assert
            Assert.AreSame(bar, barMock.Object);
            Assert.AreSame(foo, fooMock.Object);

            _mapperMock.Verify(x => x.Map(fooMock.Object), Times.Once());
            _mapperMock.Verify(x => x.Map(barMock.Object), Times.Once());
        }
    }

    public class Bar
    {
    }

    public class Foo
    {
    }
}