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Mock Internal Interface With NMock2 - Use InternalsVisibleToAttribute

Yesterday I badly needed to create mocks for my internal interfaces. I am using NMock2 as a Mocking framework and found it really difficult to produce Mocks for internal interfaces. After some ‘google time’ and investigation I found that you need the following two lines in your AssemblyInfo.cs to achieve this purpose-

[assembly: InternalsVisibleTo(“Mocks”)]
[assembly: InternalsVisibleTo(“MockObjects”)]

Where are the two assemblies? I found that these two assemblies are dynamically created by NMock2 for mocking your interfaces.

To find out the truth yourself, just put a breakpoint and watch the value of the following line-

AppDomain.CurrentDomain.GetAssemblies()

You should see the two assemblies in the list of the assemblies in the current application domain.

I found it interesting. I wish someone of you might find it useful too!

Note: You may still need to add InternalsVisibleTo attribute for your test assembly with the above two declarations.

Comments

Urs
I’ll add this information to the documentation I’m currently writing for NMock2 (http://sourceforge.net/projects/nmock2/)

Happy mocking
Urs