How to Mock a Static Singleton?

Question

I have number of classes I\'ve been asked to add some unit tests to with Rhino Mocks and having some issues.

First off, I know RhinoMocks doesn\'t allow for the mock

Answer 1

You can mock the interface, ISomeInterface. Then, refactor the code that uses it to use dependency injection to get the reference to the singleton object. I have come across this problem many times in our code and I like this solution the best.

for example:

public class UseTheSingleton
{
    private ISomeInterface myX;

    public UseTheSingleton(ISomeInterface x)
    {
        myX = x;
    }

    public void SomeMethod()
    {
        myX.
    }
}

Then ...

UseTheSingleton useIt = UseTheSingleton(Example1.Instance);