How to choose the correct overload (Generic T / object)

Question

I'm trying to mock the IMemoryCache interface.

The IMemoryCache interface looks like:

public interface IMemoryCache : IDisposable
{
    //...
    bool TryGetValue(object key, out object value);
    //...
}

And the ImemoryCache has an extension method (namespace Microsoft.Extensions.Caching.Memory of:

public static class CacheExtensions
{
    public static bool TryGetValue<TItem>(this IMemoryCache cache, object key, out TItem value);
}

The mocking process is:

AutoMock mock = AutoMock.GetLoose();

string access_token = Guid.NewGuid().ToString();

var memoryCacheMock = mock.Mock<IMemoryCache>();
memoryCacheMock
    .Setup(x => x.TryGetValue(It.IsAny<object>(), out access_token))
    .Returns(true);

I'm trying to mock the TryGetValue method of the interface (not the extension method), but it automatically refers to the extension (it is not possible to mock an extension method).

When I hover the TryGetValue it show that it is referring to the extension:

How to make the setup of TryGetValue refer to the overloaded interface method?

Edit:

Changing the string into object make it worked, but why? the string is a type of object.

Why are you even trying to mock the extension method in the first place? Mock the relevant bits of `IMemoryCache` and the extension method will call them. — DavidG, Aug 29 '19 at 09:22
Hey @DavidG, I'm not trying to mock the extension method, only the method of the interface — Shahar Shokrani, Aug 29 '19 at 09:23
Sorry, slightly misread the question. You need to make the second parameter an object. Because you are giving it a string, it uses the extension instead. — DavidG, Aug 29 '19 at 09:25
@ShaharShokrani See if this works https://stackoverflow.com/a/42387886/5233410 . If it does then its a duplicate. — Nkosi, Aug 29 '19 at 10:12

How to choose the correct overload (Generic T / object)

Edit:

0 Answers0