MOQ验证无效

Question

I have an odd problem when using moq.

In one project when I try to verify that a method has been called it says it has not. When I debug the test it clearly calls the method.

It's a simple cache object where I want to see if I add something to the cache. I have (among others) Add, Contains and Get methods.

My verify works fine on these methods:

bool Contains(string key);
T Get<T>(string key);

But not on this:

void Add(string key, object objectToCache, CacheItemPolicy policy);

I have tried whit the exact values I give to the method as this:

mockedCache.Verify(p => p.Add(LOCATION_CACHE_KEY, locations, policy), Times.Once());

Using It.IsAny

mockedCache.Verify(p => p.Add(It.IsAny<string>(), It.IsAny<IEnumerable<string>>(),
     It.IsAny<CacheItemPolicy>()), Times.Once());

And no matter what I try I get the response that it was called 0 times.

I have never seen this behaviour before. Can anybody tell me what is wrong?

Thanks

Michael

Update: As @SergRogovtsev suggested, I looked at the output moq generated.

My method whas not called with IEnumerable but with List

Answer 1

As you've seen, Moq is not checking the exact types of the parameters passed, not just that they derive from the type you are asserting. If you want that functionality you may need to use something like this:

mockedCache.Verify(p => p.Add(It.IsAny<string>(), It.Is<object>(o => o is IEnumerable<string>), It.IsAny<CacheItemPolicy>()), Times.Once());

Otherwise you could look into getting an updated version of Moq - I have tested your original scenario (using It.IsAny<IEnumerable<string>> in the assertion) and it works correctly with Moq v4.0)

Answer 2

Does CacheItemPolicy implements an interface? If so, will you try verifying the call with

mockedCache.Verify(p => p.Add(It.IsAny<string>(), It.IsAny<IEnumerable<string>>(), It.IsAny<ICacheItemPolicy>()), Times.Once());

or whatever the interface's name is?

I had the same problem. Thing is, my SUT method received an interface, and that's what it passed to the mocked object. Though the class may implement the interface, the interface is still a different type. Hope this helps.