有一个功能:

public class MyCacheClass : ICache
{
    public void T GetObject<T>(Func<T> func)
    {
        T t;
        ...
        t = func();
        ...
        return t;
    }
}

public class MyWorkClass : IWork
{
    public Object MyWorkMethod(string value)
    {
        return new object();
    }
}


可以通过以下方式调用这些函数:

public class MyTestableClass
{
    public void MyTestableFunc(ICache cache, IWorkClass work)
    {
        string strVal="...";
        ...
        Object obj = cache(()=>work.MyWorkMethod(strVal));
        ...
    }
}


有必要为此编写一个UnitTest(带有Moq),并检查传递给'MaCacheClass.GetObject'的参数是否正确。

应该是这样的:

[TestMethod]
public void MyTest()
{
    Mock<ICache> mockCache = new Mock<ICache>();
    Mock<IWorkClass> mockWorkClass  = new Mock<IWorkClass>();

    MyTestableClass testable = new MyTestableClass();
    testable.MyTestableFunc(mockCache.Object, mockWorkClass.Object);

    // should I check if 'MyCacheClass' was called with proper parameter?
    mockCache.Verify(mock=>mock.GetObject(...)).Times.Once());
}


如何提供适合“ lambda函数”的参数?
还有其他选择吗?

任何想法都欢迎。

最佳答案

选项之一可能是:相反,在Funct参数上传递一些使用'GetObject'函数实现接口的对象,例如:

public interface IGetObject
{
    T GetObject<T>();
}

public class MyGetObject : IGetObject
{
    public MyGetObject()
    {
    }

    public void Init(string strVal, Func<string, T> func)
    {
        _strVal = strVal;
        _func = func;
    }

    public T GetObject<T>()
    {
        return _func(_strVal);
    }
}

public class MyCacheClass : ICache
{
    public void T GetObject<T>(IGetObject getter)
    {
        T t;
        ...
        t = getter.GetObject<T>();
        ...
        return t;
    }
}

public class MyTestableClass
{
    public void MyTestableFunc(ICache cache, IWorkClass work)
    {
        string strVal="...";
        IGetObject getter = UnityContainer.Resolve<IGetObject>();
        getter.Init(strVal, str=>work.MyWorkMethod(str));
        ...
        Object obj = cache.GetObject(getter);
        ...
    }
}


我猜在这种情况下,我们还需要将UnityContainer注入到测试对象中,因此将是这样的:

[TestMethod]
public void MyTest()
{
    Mock<ICache> mockCache = new Mock<ICache>();
    Mock<IWorkClass> mockWorkClass  = new Mock<IWorkClass>();
    Mock<IGetObject> mockGetter  = new Mock<IGetObject>();

    mockGetter.Setup(mock=>mock.GetObject()).Return(new Object());

    MyTestableClass testable = new MyTestableClass();
    testable.MyTestableFunc(mockCache.Object, mockWorkClass.Object);

    // should I check if 'MyCacheClass' was called with proper parameter?
    mockCache.Verify(mock=>mock.GetObject(mockGetter.Object)).Times.Once());
}


并为'MyCacheClass'的'GetObject'方法提供额外的测试,将检查它是否调用IGetObject参数的'GetObject'方法...

附言有点复杂的解决方案...因此,如果有人看到更好的解决方案,请告知!

关于.net - 如何使用Moq测试Lambda函数?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/3752565/

10-11 01:05