.net - How to Mock the Internal Method of a class?

Question

I have a class which has a internal method and i want to mock the internal method . But i am unable to mock it i.e. it is not calling the mocked function but calling the original function. Is there any way to achieve this ?

Edit:Actually i am a novice to the Moq. I have many classes and methods of the classes to test using the Moq. Many classes are internal , many have internal methods, many have not-virtual methods . And can not change the signature on the methods and classes. Can anyone please let me know how to go about testing this scenario using Moq. Or else please suggest me some other testing framework which is easy to learn and easy to work with .

Answer 1

You can easily mock internal virtual methods by adding the following to your AssemblyInfo.cs:

[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")] // namespace in Moq
[assembly: InternalsVisibleTo("YourTestClass")]

If your assembly is strongly named, you'll need to include the public key for DynamicProxyGenAssembly2 (Thanks to comment by @bvgheluwe; source: Moq quickstart guide):

[assembly:InternalsVisibleTo("DynamicProxyGenAssembly2,PublicKey=0024000004800000940000000602000000240000525341310004000001000100c547cac37abd99c8db225ef2f6c8a3602f3b3606cc9891605d02baa56104f4cfc0734aa39b93bf7852f7d9266654753cc297e7d2edfe0bac1cdcf9f717241550e0a7b191195b7667bb4f64bcb8e2121380fd1d9d46ad2d92d2d15605093924cceaf74c4861eff62abf69b9291ed0a340e113be11e6a7d3113e92484cf7045cc7")]

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I don't understand why the accepted answer says you should never do it. Isn't that what you do when you use the 'Extract and Override' (local factory method) dependency injection technique outlined by Roy Osherove in Chapter 3 of The Art Of Unit Testing?